John Yaw Ofori
31Patents
5h-index
25Co-inventors
61Inventor score
Filing activity: Nov 3, 1997 → Nov 7, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6197991A | Method and catalyst system for producing | Performing Operations; Transporting | 21 | Expired |
| US6245929A | Catalyst composition and method for producing diaryl carbonates, using bisphosphines | Chemistry; Metallurgy | 18 | Expired |
| US5981788A | Method for recovering and recycling catalyst constituents | Emerging Cross-Sectional Technologies | 11 | Expired |
| US6143914A | Method and catalyst system for producing aromatic carbonates | Performing Operations; Transporting | 6 | Expired |
| US6215015A | Catalyst composition and method for producing diaryl carbonates, using bisphosphines | Chemistry; Metallurgy | 5 | Expired |
| US6380417B1 | Catalysts system for producing aromatic carbonates | Performing Operations; Transporting | 5 | Expired |
| US6683015B2 | Method for reactivating a catalyst composition | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6815565B2 | Method for preparing hydroquinones and dihydroxybiphenyl compounds from mixtures of bromophenols and benzoquinones | Chemistry; Metallurgy | 4 | Expired |
| US6191060A | Reclamation of metal catalysts used in the production of diaryl carbonates | Emerging Cross-Sectional Technologies | 4 | Expired |
| US6160154A | Method and catalyst system for producing aromatic carbonates | Performing Operations; Transporting | 3 | Expired |
| US6090737A | Removal of lead from organic diaryl carbonate reaction mixtures | Emerging Cross-Sectional Technologies | 3 | Expired |
| US6310232A | Method for recycle of bromide-containing catalyst constituents | Emerging Cross-Sectional Technologies | 3 | Expired |
| US6420589B1 | Process for the production of diaryl carbonates | Chemistry; Metallurgy | 2 | Expired |
| US6143937A | Recovery of hydroxyaromatic compound from aqueous extract solutions | Chemistry; Metallurgy | 2 | Expired |
| US6420587B2 | Catalyst system for producing aromatic carbonates | Performing Operations; Transporting | 2 | Expired |
| US6384262B1 | Process for the production of diaryl carbonates | Chemistry; Metallurgy | 2 | Expired |
| US6410774B1 | Method for recovery of catalyst components | Chemistry; Metallurgy | 1 | Expired |
| US6310229A | Lead halophenoxides and carbonylation catalyst and method for preparing and employing them | Performing Operations; Transporting | 1 | Expired |
| US6521777B2 | Process for the production of diaryl carbonates | Chemistry; Metallurgy | 1 | Expired |
| US6472551B2 | Process for the production of diaryl carbonates | Chemistry; Metallurgy | 1 | Expired |
| US6407027B2 | Catalyst composition and method for producing diaryl carbonates, using bisphosphines | Chemistry; Metallurgy | 0 | Expired |
| US7345187B2 | Method and apparatus for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates | Performing Operations; Transporting | 0 | Expired |
| US7002046B2 | Process for the recovery of dihydroxybiaryl compounds | Chemistry; Metallurgy | 0 | Expired |
| US7053251B2 | Bromination of hydroxyaromatic compounds | Chemistry; Metallurgy | 0 | Expired |
| US7045666B2 | Bromination of hydroxyaromatic compounds and further conversion to dihydroxyaromatic compounds | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.