David A. Krohn
29Patents
10h-index
19Co-inventors
72Inventor score
Filing activity: Apr 24, 1974 → Mar 14, 2000
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4042405A | High strength ophthalmic lens | Emerging Cross-Sectional Technologies | 84 | Expired |
| US4073579A | Ophthalmic lens with locally variable index of refraction and method of making same | Chemistry; Metallurgy | 79 | Expired |
| US5381504A | Optical fiber element having a permanent protective coating with a Shore D hardness value of 65 or more | Chemistry; Metallurgy | 62 | Expired |
| US3996627A | Artificial intraocular lens | Emerging Cross-Sectional Technologies | 57 | Expired |
| US4277270A | Method of manufacture of optical fiber | Chemistry; Metallurgy | 28 | Expired |
| US4500870A | Method and components for remote reading of utility meters | Physics | 25 | Expired |
| US4012131A | High strength ophthalmic lens | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6593913B1 | Method and system for selecting a displayed character using an input device | Physics | 19 | Expired |
| US4277271A | Method of manufacturing graded index optical fibers | Chemistry; Metallurgy | 13 | Expired |
| US4036624A | Heat treatment method for making photochromic gradient lenses | Performing Operations; Transporting | 10 | Expired |
| US4679029A | Optoelectronic rotational position sensor | Physics | 10 | Expired |
| US3997249A | Ion exchangeable segment glass | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5221308A | Low loss infrared transmitting hollow core optical fiber method of manufacture | Physics | 9 | Expired |
| US4289516A | Low loss optical fibers | Chemistry; Metallurgy | 9 | Expired |
| USRE36146E | Optical fiber element having a permanent protective coating with a shore D hardness value of 65 or more | General | 9 | Expired |
| US4163654A | Method of manufacturing graded index optical fibers | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4606226A | Liquid level sensor | Physics | 8 | Expired |
| US4155734A | Preparation of photochromic gradient lenses | Performing Operations; Transporting | 8 | Expired |
| US4080051A | Preparation of photochromic gradient lenses of cosmetically improved color | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4101302A | Photochromic gradient lenses | Chemistry; Metallurgy | 7 | Expired |
| US3935020A | Faraday rotation glasses | Chemistry; Metallurgy | 7 | Expired |
| US4698616A | Optoelectronic rotational position sensor | Physics | 6 | Expired |
| US4015965A | Method of making artificial intraocular lenses with holes | Human Necessities | 6 | Expired |
| US4028082A | Method of making artificial intraocular lenses with holes | Chemistry; Metallurgy | 6 | Expired |
| US5073027A | Fiber optic displacement measuring apparatus | Physics | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.