Robert A. Keppel
19Patents
9h-index
15Co-inventors
69Inventor score
Filing activity: Apr 27, 1976 → Feb 25, 1999
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5168090A | Shaped oxidation catalyst structures for the production of maleic anhydride | Performing Operations; Transporting | 47 | Expired |
| US6005121A | High productivity process for the production of maleic anhydride | Performing Operations; Transporting | 36 | Expired |
| US4567158A | Process for preparing phosphorus-vanadium mixed oxide oxidation catalysts | Performing Operations; Transporting | 17 | Expired |
| US5641722A | High performance VPO catalyst and process of preparation thereof | Performing Operations; Transporting | 15 | Expired |
| US4632915A | Iron/lithium--promoted catalysts for the production of maleic anhydride | Performing Operations; Transporting | 14 | Expired |
| US5773382A | High performance VPO catalyst and process of preparation thereof | Performing Operations; Transporting | 10 | Expired |
| US4409127A | Attrition resistant metal/oxygen compositions and a process for their preparation | Performing Operations; Transporting | 9 | Expired |
| US6046343A | Prevention of catalyst attrition and tar formation in manufacture of maleic anhydride | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5945368A | Molybdenum-modified vanadium-phosphorus oxide catalysts for the production of maleic anhydride | Performing Operations; Transporting | 9 | Expired |
| US4562268A | Process for producing maleic anhydride | Performing Operations; Transporting | 8 | Expired |
| US4670415A | Process for the preparation of iron/lithium -promoted catalysts for the production of maleic anhydride | Performing Operations; Transporting | 5 | Expired |
| US5929256A | Production of maleic anhydride using molybdenum-modified vanadium-phosphorus oxide catalysts | Performing Operations; Transporting | 5 | Expired |
| US5877331A | Prevention of catalyst attrition and tar formation in manufacture of maleic anhydride | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4560674A | Catalysts for the production of maleic anhydride | Performing Operations; Transporting | 2 | Expired |
| US4091019A | Preparation of unsaturated primary amines | Chemistry; Metallurgy | 2 | Expired |
| US4443642A | Attrition resistant metal/oxygen compositions | Performing Operations; Transporting | 2 | Expired |
| US4409133A | Attrition resistant bismuth-containing metal/oxygen compositions and a process for their preparation | Performing Operations; Transporting | 2 | Expired |
| US4443641A | Attrition resistant bismuth-containing metal/oxygen compositions | Emerging Cross-Sectional Technologies | 1 | Expired |
| US5734066A | Supression of autoignition in maleic anhydride production | Chemistry; Metallurgy | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.