Yoshio Hamashima
38Patents
9h-index
29Co-inventors
71Inventor score
Filing activity: Jan 29, 1976 → Feb 9, 1990
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4634697A | Carboxyalkenamidocephalosporins | Chemistry; Metallurgy | 50 | Expired |
| US4812561A | Crystalline hydrate of oral cephalosporin and its composition | Human Necessities | 40 | Expired |
| US4066641A | Method for cyclization to give cephem ring | Chemistry; Metallurgy | 26 | Expired |
| US4933443A | Method for preparing crystalline hydrate of oral celphalosporin and its composition | Human Necessities | 24 | Expired |
| US5017380A | Gelatin hard capsule containing crystalline hydrate of oral cephalosporin | Human Necessities | 19 | Expired |
| US4226864A | 7-Substituted aminoacetamido oxadethiacephalosporins | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4079181A | Certain 7-oxo-4-thio-2,6-diazabicyclo-3,2,0-hept-2-ene compounds | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4346218A | Cyclization process to form cephem ring | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4183855A | Oxazolinoazetidinylbutyric acid derivatives | Chemistry; Metallurgy | 11 | Expired |
| US4731362A | Alkylcarbamoyloxymethylcephem compounds | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4254119A | 3-Unsubstituted-3-cephem compounds | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4232151A | Dihydrotriazinylthiooxacephalosporins | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4160085A | Cyclization to form cephem ring and intermediates therefor | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4130557A | Method for the hydrolysis of azetidinothiazoline compounds | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4143038A | Cephalosporin analogues | Chemistry; Metallurgy | 5 | Expired |
| US4332722A | Cyclization to form cephem ring and intermediates therefor | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4220766A | Oxazolines | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4647658A | Process for preparing aminohydroxycephamcarboxylates | Chemistry; Metallurgy | 4 | Expired |
| US4081595A | Reduction giving 3-cephem compounds | Chemistry; Metallurgy | 4 | Expired |
| US4604460A | 1-oxadethiacepham compounds | Chemistry; Metallurgy | 3 | Expired |
| US4491547A | Fluoromethylthioacetic acid compounds | Chemistry; Metallurgy | 3 | Expired |
| US4443598A | 1-Oxadethiacepham compounds | Chemistry; Metallurgy | 3 | Expired |
| US4366316A | 1-Oxadethiacepham compounds and process for producing said compounds | Chemistry; Metallurgy | 3 | Expired |
| US4271295A | Oxazolines | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4731361A | Alkeneamidocephalosporin esters | Human Necessities | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.