The United States of America, as represented by the Secretary of Agriculture
2,508Patents
819Active
2,508Granted
52Portfolio score
Filing activity: Apr 9, 1970 → Feb 15, 2024 · 225 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7446131B1 | Porous polymeric matrices made of natural polymers and synthetic polymers and optionally at least one cation and methods of making | Chemistry; Metallurgy | 767 | Expired |
| US4313946A | Chemotherapeutically active maytansinoids from Trewia nudiflora | Chemistry; Metallurgy | 292 | Expired |
| US4315929A | Method of controlling the European corn borer with trewiasine | Human Necessities | 282 | Expired |
| US4272398A | Microencapsulation process | Emerging Cross-Sectional Technologies | 193 | Expired |
| US5135759A | Method to preselect the sex of offspring | Human Necessities | 183 | Expired |
| US4845035A | Enzyme immobilization with a hydrolyzed polysaccharide graft copolymer | Chemistry; Metallurgy | 172 | Expired |
| US5985216A | Flow cytometry nozzle for high efficiency cell sorting | Physics | 171 | Expired |
| US5621421A | Antenna and mounting device and system | Electricity | 160 | Expired |
| US6232880A | Animal control system using global positioning and instrumental animal conditioning | Human Necessities | 151 | Expired |
| US5960104A | Defect detection system for lumber | Physics | 140 | Expired |
| US3935099A | Method of reducing water content of emulsions, suspensions, and dispersions with highly absorbent starch-containing polymeric compositions | Performing Operations; Transporting | 137 | Expired |
| US5234060A | Pressure and depth control in agricultural implement | Human Necessities | 128 | Expired |
| US5418031A | Combination cellulosic/thermoplastic batt insulation and a method of production for such insulation | Emerging Cross-Sectional Technologies | 126 | Expired |
| US5233520A | Method and system for measurement of intake of foods, nutrients and other food components in the diet | Emerging Cross-Sectional Technologies | 118 | Expired |
| US5223090A | Method for fiber loading a chemical compound | Textiles; Paper | 109 | Expired |
| US4393019A | Method of pressing reconstituted lignocellulosic materials | Performing Operations; Transporting | 107 | Expired |
| US4246310A | High performance, lightweight structural particleboard | Emerging Cross-Sectional Technologies | 106 | Expired |
| US4141302A | Furrow opener and apparatus for no-tillage transplanters and planters | Emerging Cross-Sectional Technologies | 106 | Expired |
| US6587575B1 | Method and system for contaminant detection during food processing | Physics | 98 | Expired |
| US4133784A | Biodegradable film compositions prepared from starch and copolymers of ethylene and acrylic acid | Chemistry; Metallurgy | 97 | Expired |
| US3959461A | Hair cream rinse formulations containing quaternary ammonium salts | Human Necessities | 97 | Expired |
| US5951977A | Competitive exclusion culture for swine | Chemistry; Metallurgy | 94 | Expired |
| US5358934A | Materials and methods for control of pests | Emerging Cross-Sectional Technologies | 88 | Expired |
| US6280986A | Stabilization of pet operon plasmids and ethanol production in bacterial strains lacking lactate dehydrogenase and pyruvate formate lyase activities | Emerging Cross-Sectional Technologies | 86 | Expired |
| US4820307A | Catalysts and processes for formaldehyde-free durable press finishing of cotton textiles with polycarboxylic acids | Textiles; Paper | 86 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.