William H. Koster
28Patents
7h-index
27Co-inventors
69Inventor score
Filing activity: Nov 23, 1973 → Mar 7, 1995
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4576749A | 3-Acylamino-1-carboxymethylaminocarbonyl-2-azetidinones | Chemistry; Metallurgy | 36 | Expired |
| US4775670A | 2-oxo-1-azetidinesulfonic acid salts | Chemistry; Metallurgy | 34 | Expired |
| US4743685A | 2-oxo-1-[[(substituted sulfonyl)amino]carbonyl]azetidines | Chemistry; Metallurgy | 25 | Expired |
| US4237128A | 7-[2-(2-Amino-4-thiazolyl)-2-[(1-carboxy-1, 1-dialkyl)alkoxyimino]acetamido]cephem sulfoxides | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4529698A | Process for preparing a 2-oxo-1-azetidinesulfonic acid salt | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4203992A | .beta.-Bromopenicillanic acid sulfone | Human Necessities | 10 | Expired |
| US4478749A | 2-Oxo-1-(substituted phosphorous)azetidines | Chemistry; Metallurgy | 7 | Expired |
| US5290929A | Heteroaryl derivatives of monocyclic beta-lactam antibiotics | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4638061A | [3S(Z)]-2-[[[1-(2-amino-4-thiazolyl)-2-[[2,2-dimethyl-4-oxo-1-(sulfoo xy)-3-azetidinyl]amino]-2-oxoethylidene]-amino]oxy] acetic acid and intermediate | Chemistry; Metallurgy | 6 | Expired |
| US4062842A | Method for preparing 7-substituted cephalosporins and 6-substituted penicillins by replacement of sulfur-containing groups | Chemistry; Metallurgy | 6 | Expired |
| US4680388A | O-sulfated spiro .beta.-lactam hydroxamic acids | Chemistry; Metallurgy | 5 | Expired |
| US4071682A | 7-.alpha. substituted imino 7-.beta. substituted thio cephalosporin derivatives | Chemistry; Metallurgy | 4 | Expired |
| US3968109A | Production of 2-(thio substituted)cephalosporin sulfoxides and 2-(thio substituted)cephalosporins | Chemistry; Metallurgy | 3 | Expired |
| US4574153A | 8-Oxo-2-oxa-1-azabicyclo(4.2.0)octane-3-carboxylic acids | Chemistry; Metallurgy | 3 | Expired |
| US4751220A | Crystalline salts of [3S(Z)]-2[[[1-(2-amino-4-thiazolyl)-2-[[2,2-dimethyl-4-oxo-1-(sulfooxy)- 3-azetidinyl]amino]-2-oxoethylidene]-amino]oxy]acetic acid | Chemistry; Metallurgy | 3 | Expired |
| US4723002A | 1-(substituted phosphorous)-azetidinone antibacterials | Human Necessities | 2 | Expired |
| US4548751A | (2-Oxo-1-azetidinyloxy)-2-propenoic acid | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4443374A | Process for preparing (3S)-3-[[(2-amino-4-thiazolyl)[(1-carboxy-1-methylethoxy)imino]-acetyl]a mino]-2-oxo-1-azetidinesulfonic acid, and 4-substituted derivatives | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4654426A | Acetylenic antibiotics | Chemistry; Metallurgy | 2 | Expired |
| US3985746A | 7-(.alpha.-Cyanomethylthio)acetamido-3-cephem carboxylates | Chemistry; Metallurgy | 2 | Expired |
| US4670554A | ((3-Acylamino-2-oxo-1-azetidinyl)oxy)methyl)phosphinic acids | Human Necessities | 1 | Expired |
| US4129731A | Process for converting 3-methylene cephalosporins to 3-heterothiomethyl cephalosporins | Emerging Cross-Sectional Technologies | 1 | Expired |
| US4638060A | O-sulfated spiro .beta.-lactam hydroxamic acids | Chemistry; Metallurgy | 1 | Expired |
| US4588828A | Acetylenic antibiotics | Chemistry; Metallurgy | 1 | Expired |
| US4587051A | Desulfonation process for preparing 2-azetidinones | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.