John J. Usher
10Patents
3h-index
15Co-inventors
53Inventor score
Filing activity: Nov 4, 1993 → Jan 11, 2005
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5459248A | Process of preparing etoposide phosphate and etoposide | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5512454A | Enzymatic acylation of 3-hydroxymethyl cephalosporins | Emerging Cross-Sectional Technologies | 4 | Expired |
| US6800465B2 | D-hydantoinase from Ochrobactrum anthropi | Chemistry; Metallurgy | 4 | Expired |
| US7470810B2 | Alkyl and aryl-thiotrifluoroacetates and process | Emerging Cross-Sectional Technologies | 2 | Active |
| US6403356B1 | Mutant penicillin G acylases | Chemistry; Metallurgy | 2 | Expired |
| US5869309A | Cephalosporin esterase gene from Rhodosporidium toruloides | Chemistry; Metallurgy | 1 | Expired |
| US5688926A | Process of preparing etoposide phosphate and etoposide | Emerging Cross-Sectional Technologies | 1 | Expired |
| US5917032A | Chemical acetylation of desacetyl-cephalosporins | Chemistry; Metallurgy | 0 | Expired |
| US6156534A | Synthesis of .beta.-lactam antibacterials using soluble side chain esters and enzyme acylase | Chemistry; Metallurgy | 0 | Expired |
| US5922907A | Precursors of .beta.-lactam antibacterials having soluble side chain esters | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.