Gerhard Fennhoff
31Patents
8h-index
61Co-inventors
74Inventor score
Filing activity: Jan 15, 1991 → Aug 28, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5410014A | Method of preparing aliphatic-aromatic polycarbonates | Chemistry; Metallurgy | 33 | Expired |
| US5302774A | Process for the production of bisphenols | Chemistry; Metallurgy | 30 | Expired |
| US5914431A | Cocatalysts for the synthesis of bisphenols | Chemistry; Metallurgy | 28 | Expired |
| US5698600A | Process for the production of bisphenols with the use of new cocatalysts | Chemistry; Metallurgy | 27 | Expired |
| US5780690A | Bisphenol synthesis on modified ion-exchange resins using specially purified carbonyl compounds | Chemistry; Metallurgy | 22 | Expired |
| US6211417A | Process for preparing bis-(4-hydroxyaryl) alkanes | Chemistry; Metallurgy | 20 | Expired |
| US5214072A | Purification of polycarbonate, polyester carbonate or polyester waste | Emerging Cross-Sectional Technologies | 10 | Expired |
| US6288284A | Method for producing bis(4-hydroxyaryl)alkanes | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5151452A | Purification of polycarbonate and polyester carbonate waste | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6307111A | Method for continuous production of dihydroxydiarylalkanes | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5382605A | Polycondensates which can be sterilized by .gamma.-radiation | Chemistry; Metallurgy | 7 | Expired |
| US5357028A | Method of preparing polycarbonates and polyester carbonates | Chemistry; Metallurgy | 6 | Expired |
| US6191316A | Method for processing mother liquors from the production of bisphenol | Emerging Cross-Sectional Technologies | 6 | Expired |
| US6723881B1 | Method for conditioning ion exchangers | Performing Operations; Transporting | 6 | Expired |
| US5393835A | Polycarbonate/ABS molding compounds | Chemistry; Metallurgy | 6 | Expired |
| US6486363B1 | Process for the manufacture of bis(4-hydroxyaryl)alkanes | Chemistry; Metallurgy | 5 | Expired |
| US5464893A | Radiation-resistant polycarbonates | Chemistry; Metallurgy | 5 | Expired |
| US5612398A | Radiation-resistant polycarbonates | Chemistry; Metallurgy | 5 | Expired |
| US5684062A | (Co)polycarbonates stabilised against .gamma.-radiation | Chemistry; Metallurgy | 5 | Expired |
| US5420241A | Process for the purification of polycarbonate and polyester carbonate solutions | Chemistry; Metallurgy | 3 | Expired |
| US5288923A | Preparation of ethers of diphenols | Chemistry; Metallurgy | 3 | Expired |
| US5376715A | Heat stabilization or aromatic polycarbonates | Chemistry; Metallurgy | 3 | Expired |
| US5773491A | (Co)polycarbonates stabilized against .gamma.-radiation | Chemistry; Metallurgy | 3 | Expired |
| US5408027A | Process for the production of aliphatic-aromatic polycarbonates | Chemistry; Metallurgy | 2 | Expired |
| US5399600A | Stabilized, flame resistant polycarbonate moulding compounds | Chemistry; Metallurgy | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.