David R. Walker
28Patents
14h-index
14Co-inventors
78Inventor score
Filing activity: Apr 28, 1986 → Nov 13, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4765897A | Polyamide membranes useful for water softening | Emerging Cross-Sectional Technologies | 72 | Expired |
| US4812270A | Novel water softening membranes | Emerging Cross-Sectional Technologies | 40 | Expired |
| US6573212B2 | Method of making shaped activated carbon | Chemistry; Metallurgy | 39 | Expired |
| US6472343B1 | Shaped activated carbon | Chemistry; Metallurgy | 30 | Expired |
| US4824574A | Novel water softening process using membranes | Performing Operations; Transporting | 29 | Expired |
| US6696384B2 | Method of making shaped activated carbon | Chemistry; Metallurgy | 29 | Expired |
| US6106673A | Method for separating components of a fermentation process byproduct containing oil bound with fibers | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5262056A | Polyamides and polypyrrolones for fluid separation membranes | Chemistry; Metallurgy | 24 | Expired |
| US5476550A | Method and apparatus for extracting soluble and dispersible materials from products using a slotted scroll extractor | Performing Operations; Transporting | 17 | Expired |
| US5114684A | In-line electromagnetic energy wave applicator | Human Necessities | 16 | Expired |
| US6556744B1 | Reduction of dispersion effects in optical transmission fibre systems | Electricity | 15 | Expired |
| US5054405A | High temperature turbulent gasification unit and method | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5052313A | Waste treatment system and method | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US5326538A | Closed sterilization system for treating a product such as toxic or infectious waste | Emerging Cross-Sectional Technologies | 14 | Expired |
| USD699141S1 | RFID tag | General | 12 | Active |
| US5285581A | Method for drying waste materials | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US7179382B2 | Coated activated carbon for automotive emission control | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5137545A | Vapor clarification system and method | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US5520780A | Method and apparatus for de-inking newsprint using counterflow extractor | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6136077A | Steam absorption apparatus | Performing Operations; Transporting | 8 | Expired |
| US5409541A | Method and apparatus for extracting soluble and dispersible materials from products using a slotted scroll extractor | Performing Operations; Transporting | 6 | Expired |
| US9034429B2 | Method for patterning a surface using selective adhesion | Physics | 6 | Active |
| US9446326B2 | Method and apparatus for ethanol production | Emerging Cross-Sectional Technologies | 3 | Active |
| US7746179B1 | Method and apparatus for selecting a frequency generating element | Electricity | 3 | Active |
| US5080581A | Method and apparatus for drying waste materials | Mechanical Engineering; Lighting; Heating | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.