Howard J. Schaeffer
12Patents
8h-index
5Co-inventors
61Inventor score
Filing activity: Mar 1, 1976 → Jun 21, 1993
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4199574A | Methods and compositions for treating viral infections and guanine acyclic nucleosides | Chemistry; Metallurgy | 136 | Expired |
| US4323573A | Adenine derivatives | Chemistry; Metallurgy | 38 | Expired |
| US4146715A | 2-Amido-9-(2-acyloxyethoxymethyl)hypoxanthines | Chemistry; Metallurgy | 27 | Expired |
| US4294831A | Purine derivatives | Chemistry; Metallurgy | 24 | Expired |
| US4287188A | Purine derivatives | Chemistry; Metallurgy | 21 | Expired |
| US4360522A | Purine derivatives | Chemistry; Metallurgy | 21 | Expired |
| US4315920A | Adenosine deaminase inhibitors | Chemistry; Metallurgy | 14 | Expired |
| US5248642A | Catalytic cracking catalysts and additives | Performing Operations; Transporting | 9 | Expired |
| US4027025A | 8-Azapurine derivatives | Human Necessities | 8 | Expired |
| US5364516A | Catalytic cracking catalysts and additives | Performing Operations; Transporting | 8 | Expired |
| US4060616A | Purine derivatives with repeating unit | Chemistry; Metallurgy | 5 | Expired |
| US4649140A | Purine derivatives | Chemistry; Metallurgy | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.