Katsuyoshi Sasagawa
46Patents
17h-index
36Co-inventors
77Inventor score
Filing activity: Aug 6, 1980 → Mar 24, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4542201A | Resin for high-refractivity lenses and lenses made of same resin | Chemistry; Metallurgy | 88 | Expired |
| US4775733A | High-refractivity plastic lens resin formed by reacting at least one polyisocyanate with at least one polythiol | Chemistry; Metallurgy | 70 | Expired |
| US5753730A | Plastic lenses having a high-refractive index, process for the preparation thereof and casting polymerization process for preparing sulfur-containing urethane resin lens and lens prepared thereby | Physics | 69 | Expired |
| US4707430A | Optical recording medium | Emerging Cross-Sectional Technologies | 69 | Expired |
| US5693738A | Composition for urethane-base plastic lens, urethane-base plastic lens obtained from the composition, and process for the production of the plastic lens | Physics | 66 | Expired |
| US5374668A | Casting epoxy resin, polythiol and releasing agent to form lens | Physics | 64 | Expired |
| US4707425A | Optical recording method and media therefor | Emerging Cross-Sectional Technologies | 62 | Expired |
| US5191055A | Mercapto compound, a high refractive index resin and lens and a process for preparing them | Physics | 49 | Expired |
| US4946923A | S-alkyl thiocarbamate base resin, plastic lens comprising the resin, and process for making the lens | Physics | 47 | Expired |
| US5087758A | Mercapto compound, a high refractive index resin and lens and a process for preparing them | Physics | 45 | Expired |
| US4314039A | Polypropylene composition containing a 1.3,2.4-di(alkylbenzylidene) sorbitol | Chemistry; Metallurgy | 41 | Expired |
| US5352758A | Mercapto compound, its preparation process, and sulfur-containing urethane resins and lenses using the same | Physics | 40 | Expired |
| US4929707A | Polyurethane base lens resin, plastic lens comprising the resin and preparation method of the lens | Performing Operations; Transporting | 35 | Expired |
| US5393607A | Laminated transparent plastic material and polymerizable monomer | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4791185A | High-refractivity plastic lens resin formed from a polyisocyanate and a polythiol | Physics | 31 | Expired |
| US5594088A | Plastic lenses having a high-refractive index, process for the preparation thereof and casting polymerization process for preparing sulfur containing urethane resin lens and lens prepared thereby | Physics | 26 | Expired |
| US5059673A | Resin for urethane lenses, lenses comprising the resin, and a process for preparation of the resin and the lenses | Physics | 21 | Expired |
| US5013496A | Process for molding a highly-refractive plastic lens | Chemistry; Metallurgy | 17 | Expired |
| US5021503A | Resin for plastic lens having high-refractive index, lens comprising the resin, and method for preparation of the lens | Chemistry; Metallurgy | 16 | Expired |
| US5126388A | Highly-refractive plastic lens and process for making the lens | Chemistry; Metallurgy | 15 | Expired |
| US4980497A | Monomer of carbonate ester having isopropenylphenyl group | Chemistry; Metallurgy | 14 | Expired |
| US5084538A | High surface hardness transparent resin prepared from a compound having at least one isopropenyl phenyl group | Physics | 14 | Expired |
| US4529684A | Composition suitable for use in the production of laser beam recording/reading means | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5104953A | Hard transparent resins and process for the production thereof | Physics | 12 | Expired |
| US5126425A | Low-hygroscopic sulfur-containing urethane resin, coating material and adhesive | Chemistry; Metallurgy | 12 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.