Richard Alan Callahan
16Patents
8h-index
3Co-inventors
65Inventor score
Filing activity: Aug 5, 1985 → Feb 24, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5233837A | Process and apparatus for producing liquid carbon dioxide | Emerging Cross-Sectional Technologies | 94 | Expired |
| US5186941A | Vesicle formulation for the controlled release of therapeutic agents | Emerging Cross-Sectional Technologies | 58 | Expired |
| US5482539A | Multiple stage semi-permeable membrane process and apparatus for gas separation | Performing Operations; Transporting | 34 | Expired |
| US6128916A | Membrane technology to remove non-condensable gases from refrigeration systems | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US11149636B2 | Turbine powered electricity generation | Emerging Cross-Sectional Technologies | 12 | Active |
| US11149634B2 | Turbine powered electricity generation | Emerging Cross-Sectional Technologies | 12 | Active |
| US4724845A | Method or systems of determining physiological status | Human Necessities | 11 | Expired |
| US5873928A | Multiple stage semi-permeable membrane process and apparatus for gas separation | Performing Operations; Transporting | 10 | Expired |
| US9353333B1 | Laundry additive and drum treatment | Chemistry; Metallurgy | 4 | Active |
| US5693121A | Semi-permeable membrane separation process for the production of very high purity nitrogen | Chemistry; Metallurgy | 3 | Expired |
| US9556404B2 | Laundry additive and drum treatment | Chemistry; Metallurgy | 2 | Active |
| US6953492B2 | Membrane technology to reduce nitrogen in natural gas | Performing Operations; Transporting | 2 | Expired |
| US11808206B2 | Tail gas recycle combined cycle power plant | Mechanical Engineering; Lighting; Heating | 1 | Active |
| US10041022B2 | Laundry additive and drum treatment | Chemistry; Metallurgy | 1 | Active |
| US11994063B2 | Turbine powered electricity generation | Emerging Cross-Sectional Technologies | 1 | Active |
| US10377970B2 | Laundry additive and drum treatment | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.