Hans Hettel
13Patents
7h-index
14Co-inventors
59Inventor score
Filing activity: Apr 2, 1982 → Jun 12, 1998
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4977194A | Process for the preparation of polyurethane foams | Chemistry; Metallurgy | 16 | Expired |
| US5023280A | Process for the production of polyurethane foams | Chemistry; Metallurgy | 15 | Expired |
| US4456709A | Polyisocyanate mixtures, process for their production and their use in the production of polyurethane plastics | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4493909A | Poly-N,N-hydroxyalkylamides of polybasic carboxylic acids and a process for the production thereof | Chemistry; Metallurgy | 10 | Expired |
| US4618706A | Process for the preparation of aromatic polyisocyanates containing urea and/or biuret groups | Chemistry; Metallurgy | 10 | Expired |
| US5977198A | Process for the production of resilient, flexible polyurethane foams | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4668734A | Stable dispersions of polyureas and/or polyhydrazo-dicarbonamides in relatively high molecular weight hydroxyl-group containing materials, a process for the production thereof and the use thereof for the production of polyurethane plastics | Chemistry; Metallurgy | 8 | Expired |
| US4546116A | Process for the production of highly elastic foams containing urethane groups and foams obtainable by this process | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5104906A | Process for the preparation of polyurethane foams | Chemistry; Metallurgy | 4 | Expired |
| US5104905A | Process for the preparation of polyurethane foams | Chemistry; Metallurgy | 3 | Expired |
| US5017623A | Process for the preparation of polyurethane foams | Chemistry; Metallurgy | 2 | Expired |
| US4981878A | Process for the production of heat curable flexible polyurethane molded foams | Chemistry; Metallurgy | 0 | Expired |
| US5158987A | Process for the preparation of highly elastic polyurethane flexible foams and their use as upholstery material | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.