Keith H. Stephen
8Patents
5h-index
14Co-inventors
56Inventor score
Filing activity: Aug 14, 1978 → Mar 22, 1996
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5460924A | Photographic peracid bleaches with ferric 2-pyridinecarboxylate and 2,6-pyridinecarboxylate catalysts | Emerging Cross-Sectional Technologies | 37 | Expired |
| US5536625A | Photographic peracid bleaches with ferric 2-pyridinecarboxylate and 2,6-pyridinecarboxylate catalysts | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4933266A | Photographic bleaching and bleach-fixing solutions | Physics | 18 | Expired |
| US5061608A | Photographic bleaching solution and use thereof in photographic color processing | Physics | 12 | Expired |
| US4256826A | Bleach-fix sheets | Physics | 5 | Expired |
| US5434035A | Fixer additives used in combination with iron complex based bleaches to improve desilvering | Physics | 5 | Expired |
| US5334491A | Photographic bleach compositions and methods of photographic processing | Physics | 5 | Expired |
| US5670305A | Photographic processing solution containing ternary ferric-complex salts | Physics | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.