Duckweed-Related Patents and Inventions

Just a few patents are listed for now.  You may search the US Patent Office database for more.

About Patents
Uses for Duckweeds
Bioremediation Technology
Genetic Engineering

About Patents

Should genes be patented?  Patents on genes are controversial because they occur in nature.  Read some thoughts on this:  [ controversy ] 

Patent issues in agricultural biotechnology, Owning Agbiotech, an article from Chemical & Engineering News (17 Sept. 2001, page 25).

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Uses for Duckweeds

United States Patent 6,013,525
Porath Jan. 11, 2000
Iron enriched duckweed extract 

Abstract

A process for the enrichment of selected mineral content of a higher plant comprising, cultivating a plant in soil-free growth medium; introducing selected minerals into a liquid component of growth medium for uptake into a plant, grinding a plant to a form a mashed product; and, separating liquid from a mashed product to form at least one concentrated extract product. 

[ Link to full text of patent ]

United States Patent  5,269,819
Porath Dec. 14, 1993
Aquaculture production of duckweed for human consumption

Abstract

The invention provides an aquaculture complex for high protein crop production of a duckweed clone suitable for human consumption comprising a body of water in combination with duckweed clones, the majority of said clones being characterized by having less than three roots per clone, said roots being less than 15 mm in length and having at least two attached fronds, at least one of said fronds being characterised by a frond thickness greater than 1 mm and a frond length greater than 4 mm.

[ Link to full text of patent ]

Israel Patent
 
SELECTED PLANT CLONES FROM THE DUCKWEED FAMILY FOR PROTEIN PRODUCTION IN AQUACULTURE

Patent Number:  
Publication date: 1990-06-10 
Inventor(s): DAN PORATH 
Applicant(s):: AGROLIFE TECHNOLOGIES ISRAEL L (IL) 
Requested Patent: IL75435 
Application Number: IL19850075435 19850607 
Priority Number(s): IL19850075435 19850607 
IPC Classification: A23J1/00 ; A23K1/18 ; C12N1/12 ; C12Q1/24 
EC Classification:  
Equivalents:

Abstract


Data supplied from the esp@cenet database - l2

 
 

Bioremediation Technology

United States Patent  6,350,350
Jensen; Kyle R. et al.
February 26, 2002

Integrated system and method for purifying water, producing pulp and paper and improving soil quality

Abstract

An integrated system and method for removing excess nutrients from water, for removing the nutrients from the removal site, for enhancing soil, and for producing pulp and paper products includes bioremediating water to be treated with cultured algae or another suitable plant matter in an attached periphyton bed, harvesting the algae/plant matter to produce a wet algal biomass, and mixing the wet biomass with a shredded fibrous material to produce a pulp. The pulp can be molded into a biodegradable package that can be utilized as a delivery vehicle to a site having nutrient-enrichable soil, where the package can be used as a soil amendment after being used as a delivery vehicle. The pulp can also be made into a paper product that is biodegradable and has the characteristic of enhancing soil quality.

[ Link to full text of patent ]

United States Patent  5,636,472
Spira; William M.; Skillicorn; Paul W.  June 10, 1997

Apparatus for the continuous cultivation of aquatic macrophytes

Abstract

An apparatus for cultivating macrophytes grown on the water surface in a circular basin structure containing a channel of plant growth nutrients water spiraling from the basin structure periphery into the center of the basin structure and then back out again to the periphery. Two spiraling berms, constructed in parallel, define the single, continuous channel of water. A conveyor means is mounted on a rotatable arm that extends from the basin structure center to the basin structure periphery and rotates about the central support. The conveyor means moves laterally along the rotatable arm so as to remain in the center of the channel of water as that arm rotates. A portion of the floating macrophytes on the water surface is harvested one or more times each day and transported to beyond the periphery of the basin structure where the floating macrophytes are available for subsequent processing. The proportion of plant cover harvested can be controlled by adjustments to the conveyor means and by adjusting the speed at which the rotatable arm rotates. The rotatable arm contains a means for dispensing macrophytes with water jet heads that mix and redistribute the plant cover after the conveyor means has passed through.

[ Link to full text of patent ]

United States Patent 5,180,501
Ngo, et al. Jan. 19, 1993

Floating aquatic plant water treatment system

Abstract

A floating aquatic plant water treatment system (31) utilizes a serpentine channel (36) defined by dividing walls (34). Floating plants (72) are distributed across the water surface by a floating grid structure (32). The grid structure (32) is preassembled into Z-fold bundles (88) which are towed onto the water and unfolded. The treatment system uses sprayers (62) to control growth conditions. Porous baffles (46) are placed along portions of the channel (36) to provide intimate contact with a larger portion of the water while allowing free flow. 

[ Link to full text of patent ]

United States Patent  5,197,263
Midtling, et. al. Mar. 30, 1993

Method and apparatus for harvesting aquatic plants

Abstract

A duckweed slurry is recovered from a body of water. The duckweed slurry includes duckweed and water from the body of water. The duckweed slurry is transported to a dewatering station. A majority of the water from the duckweed slurry is removed at the dewatering station. Water removed from the duckweed slurry is returned to the body of water.

[ Link to full text of patent ]

United States Patent  5,096,577
Ngo, et al. Mar. 17, 1992

Floating aquatic plant water treatment system

Abstract

A floating aquatic plant water treatment system (31) utilizes a serpentine channel (36) defined by dividing walls (34). Floating plants (72) are distributed across the water surface by a floating grid structure (32). The grid structure (32) is preassembled into Z-fold bundles (88) which are towed onto the water and unfolded. The treatment system uses sprayers (62) to control growth conditions. Porous baffles (46) are placed along portions of the channel (36) to provide intimate contact with a larger portion of the water while allowing free flow.

[ Link to full text of patent ]

United States Patent  4,536,988
Hogen Aug. 27, 1985

Aquatic biomass containment barrier and method of assembling same

Abstract

The present invention relates to a floating containment barrier grid structure (20) for containment of floating aquatic plants (26) in a body of water (30). The barrier grid structure (20) includes a plurality of interconnected square barrier segments (24), the top edge of the barrier segments extending above the surface of the water so as to prohibit substantial wave action. The floating containment barrier grid structure (20) being anchored by cables (38) and stakes (40) in a somewhat tensioned state while floating in the body of water (30). The barrier grid structure (20) being tensioned to enable portions of the barrier grid structure (20) to be submerged beneath the surface of the water by a harvesting machine (28) while harvesting the floating aquatic plants (26).

[ Link to full text of patent ]


 

Duckweed Genetic Engineering


United States Patent 8,022,270
Dickey,  et al. September 20, 2011
 Expression of biologically active polypeptides in duckweed

Abstract

Methods, nucleic acid sequences, and transformed duckweed plant or duckweed nodule cultures for the expression and the secretion of biologically active polypeptides from genetically engineered duckweed are provided. Expression of recombinant polypeptides in duckweed is improved by modifying the nucleotide sequence of the expression cassette encoding the polypeptide for improved expression in duckweed. Recovery of biologically active polypeptides from duckweed is improved by linking the biologically active polypeptide to a signal peptide that directs the secretion of the polypeptide into the culture medium.

[ Link to full text of patent ]

United States Patent 8,017,836
Spencer,  et al. September 13, 2011
 Expression of plasminogen and microplasminogen in duckweed

Abstract

The present invention provides methods and compositions for the production of recombinant plasminogen, microplasminogen, and fragments thereof in a duckweed expression system. It is the novel finding of the present invention that a duckweed expression system may be used to produce high levels of plasminogen and microplasminogen. The duckweed-produced plasminogen and microplasminogen can be activated to produce a polypeptide having protease activity. Thus, the invention encompasses methods for the expression of plasminogen, microplasminogen, and fragments thereof in duckweed, duckweed plants that are transformed with expression cassettes for the expression of plasminogen, microplasminogen, and fragments thereof, and nucleic acids comprising nucleotide sequences encoding plasminogen, microplasminogen, and fragments thereof, where these nucleotide sequences are modified to enhance their expression in duckweed.

[ Link to full text of patent ]

United States Patent 7,884,264
Dickey,  et al. February 8, 2011
 Compositions and methods for inhibition of fucosyltransferase and xylosyltransferase expression in duckweed plants

Abstract

Methods for altering the N-glycosylation pattern of proteins in higher plants are provided. In some embodiments, the methods comprise introducing into a duckweed plant a recombinant RNAi construct that provides for the inhibition of expression of .alpha.1,3-fucosyltransferase (FucT) and .beta.1,2-xylosyltransferase (XylT). Use of these RNAi constructs to inhibit or suppress expression of both of these enzymes, and isoforms thereof, advantageously provides for the production of endogenous and heterologous proteins having a "humanized" N-glycosylation pattern without impacting plant growth and development. Stably transformed higher plants, including duckweed plants, having this protein N-glycosylation pattern are provided. Glycoprotein compositions, including monoclonal antibody compositions, having substantially homogeneous glycosylation profiles, and which are substantially homogeneous for the G0 glycoform, are also provided.

[ Link to full text of patent ]

United States Patent 7,709,699
Stomp ,   et al. May 4, 2010
Use of duckweed in high throughput screening

Abstract

Methods for high-throughput screening in duckweed are disclosed. In one aspect, these methods are used to identify nucleotide sequences encoding polypeptides of interest. In another aspect, these methods are used to identify nucleotide sequences that modulate the expression of a target nucleotide sequence. The methods combine the predictive benefits of screening in whole plants with the speed and efficiency of a high throughput system.

[ Link to full text of patent ]

United States Patent 7,632,983
Dickey,  et al. December 15, 2009
Expression of monoclonal antibodies in duckweed   

Abstract

Methods, nucleic acid sequences, and transformed duckweed plant or duckweed nodule cultures for the expression and the secretion of biologically active polypeptides from genetically engineered duckweed are provided. Expression of recombinant polypeptides in duckweed is improved by modifying the nucleotide sequence of the expression cassette encoding the polypeptide for improved expression in duckweed. Recovery of biologically active polypeptides from duckweed is improved by linking the biologically active polypeptide to a signal peptide that directs the secretion of the polypeptide into the culture medium. Methods of producing recombinant monoclonal antibodies having effector function, and antibodies produced by these methods are provided.

[ Link to full text of patent ]

United States Patent 7,161,064
Stomp,  et al. January 9, 2007
 Method for producing stably transformed duckweed using microprojectile bombardment  

Abstract

Methods and compositions for the efficient transformation of duckweed are provided. The methods involve transformation by ballistic bombardment. In this manner, any gene or nucleic acid of interest can be introduced and expressed in duckweed plants. Transformed duckweed plants, cells, tissues are also provided. Transformed duckweed plant tissue culture and methods of producing recombinant proteins and peptides from transformed duckweed plants are also disclosed.

[ Link to full text of patent ]

United States Patent 6,815,184
Stomp, et. al. November 9, 2004

Expression of biologically active polypeptide in duckweed

Abstract

Methods, nucleic acid sequences, and transformed duckweed plant or duckweed nodule cultures for the expression and the secretion of biologically active polypeptides from genetically engineered duckweed are provided. Expression of recombinant polypeptides in duckweed is improved by modifying the nucleotide sequence of the expression cassette encoding the polypeptide for improved expression in duckweed. Recovery of biologically active polypeptides from duckweed is improved by linking the biologically active polypeptide to a signal peptide that directs the secretion of the polypeptide into the culture medium.

[ Link to full text of patent ]

United States Patent 6,040,498
Stomp, et. al. Mar. 21, 2000

Genetically engineered duckweed 

Abstract

Methods and compositions for the efficient transformation of duckweed are provided. Preferably, the methods involve transformation by either ballistic bombardment or Agrobacterium. In this manner, any gene or nucleic acid of interest can be introduced and expressed in duckweed plants.  Transformed duckweed plants, cells, tissues are also provided. Transformed duckweed plant tissue culture and methods of producing recombinant proteins and peptides from transformed duckweed plants are also disclosed. 

[ Link to full text of patent ]


 
World Intellectual Property Organization
Title: GENETICALLY ENGINEERED DUCKWEED
Publication date: 1999-02-18

Inventor(s):

STOMP ANNE-MARIE (US); RAJBHANDARI NIRMALA (US)
Applicant(s): UNIV NORTH CAROLINA (US); STOMP ANNE MARIE (US); RAJBHANDARI NIRMALA (US)
Requested Patent: WO9907210
Application Number: WO1998US16683 19980811
Priority Number(s): US19970055474P 19970812 
  A01H4/00 ; C12N5/04 ; C12N5/14 ; C12N15/82 ; C12N15/84
Field of the Invention

"Methods and compositions for the efficient transformation of duckweed are provided. Preferably, the methods involve transformation by either ballistic bombardment or Agrobacterium. In this manner, any gene or nucleic acid of interest can be introduced and expressed in duckweed plants. Transformed duckweed plants, cells, tissues are also provided. Transformed duckweed plant tissue culture and methods of producing recombinant proteins and peptides from transformed duckweed plants are also disclosed."

[ Link to full text of patent ]


 

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Revised:  October 6, 2012