Manfred Bergfeld
36Patents
7h-index
10Co-inventors
66Inventor score
Filing activity: Mar 13, 1974 → Jul 8, 1999
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4301257A | Polyfunctional isocyanates free of alkali and urea groups | Chemistry; Metallurgy | 27 | Expired |
| US4178315A | Process for the preparation of nitrosobenzene | Performing Operations; Transporting | 18 | Expired |
| US4404401A | Process for the preparation of para-amino-diphenylamine | Chemistry; Metallurgy | 18 | Expired |
| US4356289A | Polymeric N-halogenoamides on the basis of acrylamide and methacrylamide | Chemistry; Metallurgy | 11 | Expired |
| US4203916A | Preparation of trans cyclohexane 1,4 diisocyanate | Chemistry; Metallurgy | 10 | Expired |
| US6159894A | Catalyst for dehydrogenation of amino alcohols to amino carboxylic acids or of ethylene glycol (derivatives) to oxycarboxylic acids, method for their production and their use | Chemistry; Metallurgy | 9 | Expired |
| US4357447A | Polymere N-halogenamide auf basis von acryl-und methacrylamid | Chemistry; Metallurgy | 8 | Expired |
| US4486603A | Preparation of trans cyclohexane 1,4-diamine | Chemistry; Metallurgy | 7 | Expired |
| US4418211A | Preparation of trans-cyclohexane-1,4-disulphonyl urea | Chemistry; Metallurgy | 7 | Expired |
| US4467114A | Preparation of trans cyclohexane 1,4-diurea | Chemistry; Metallurgy | 6 | Expired |
| US4439370A | Preparation of trans cyclohexane 1,4-diisocyanate | Chemistry; Metallurgy | 6 | Expired |
| US4275223A | Preparation of trans-cyclohexane-1,4-diurethanes | Chemistry; Metallurgy | 5 | Expired |
| US4057588A | Process for the preparation of phloroglucinol | Chemistry; Metallurgy | 5 | Expired |
| US4457871A | Preparation of trans cyclohexane,1,4-diisocyanate and related compounds | Chemistry; Metallurgy | 5 | Expired |
| US4307236A | Process for the preparation of dithiazole-disulfides | Chemistry; Metallurgy | 5 | Expired |
| US4468526A | Process for the preparation of thiuram disulfides | Chemistry; Metallurgy | 4 | Expired |
| US4238404A | Process for the preparation of isocyanate derivatives of aliphatic, cycloaliphatic, and araliphatic compounds | Chemistry; Metallurgy | 4 | Expired |
| US4459424A | Process for the preparation of thiuram disulfides | Chemistry; Metallurgy | 4 | Expired |
| US4316031A | Process for the preparation of 2-mercaptobenzothiazole | Chemistry; Metallurgy | 4 | Expired |
| US4129740A | Process for the preparation of para-nitroso-diphenylhydroxylamines | Chemistry; Metallurgy | 3 | Expired |
| US4210602A | Process for the preparation of asymmetrical N-phenyl-N'-substituted para-phenylene diamines | Chemistry; Metallurgy | 3 | Expired |
| US4259258A | Preparation of bis-n-chloramides of cycloaliphatic carboxylic acids | Chemistry; Metallurgy | 3 | Expired |
| US4558135A | Process for the preparation of dithiazolyl disulfides | Chemistry; Metallurgy | 2 | Expired |
| US4071555A | Benzene-1,3,5-tris-acetoxime and the process for making phloroglucinol therewith | Chemistry; Metallurgy | 2 | Expired |
| US4342707A | Process for the preparation of bis-N-chloramides | Chemistry; Metallurgy | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.