Martin Ullrich
31Patents
11h-index
59Co-inventors
78Inventor score
Filing activity: Jul 17, 1974 → Jul 31, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3963679A | Process for the production of polyurethane elastomers | Chemistry; Metallurgy | 92 | Expired |
| US6175141A | Opto-electronic sensor component | Emerging Cross-Sectional Technologies | 46 | Expired |
| US4181788A | Process for the production of thermoplastic molding materials based on vinyl polymers | Performing Operations; Transporting | 21 | Expired |
| US5334358A | Self-cleaning reactor/mixer with large useful volume | Performing Operations; Transporting | 18 | Expired |
| US6417312B1 | Thermoplastic polyurethane elastomers | Chemistry; Metallurgy | 16 | Expired |
| US4040607A | Method of building up pressure by multi-shaft screw extruders | Performing Operations; Transporting | 15 | Expired |
| US4092089A | Apparatus for the preparation of melt-sprayed spherical phenacetin granules | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4086346A | Preparation of melt-sprayed spherical phenacetin granules | Human Necessities | 14 | Expired |
| US4318677A | Small volume outlet apparatus with a sieve changing device for multiple shaft screw machines | Performing Operations; Transporting | 12 | Expired |
| US4318773A | Process for the concentration of solutions with simultaneous setting | Performing Operations; Transporting | 12 | Expired |
| US5399012A | Fully self-cleaning reactor/mixer with a large usable volume | Performing Operations; Transporting | 11 | Expired |
| US4352568A | Twin-screw machine with screws rotatable in the same direction | Performing Operations; Transporting | 11 | Expired |
| US5658075A | Self-cleaning reactor/mixer for highly viscous and solids-bearing materials to be mixed | Performing Operations; Transporting | 11 | Expired |
| US5669710A | Completely self-cleaning mixer/reactor | Performing Operations; Transporting | 10 | Expired |
| US5767224A | Two-step process for the production of thermoplastic polycarbonate | Chemistry; Metallurgy | 9 | Expired |
| US4522862A | High resolution recording medium and method for producing same | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6153692A | Process for the production of elastomer-modified thermoplastics | Chemistry; Metallurgy | 6 | Expired |
| US4162854A | Multi-shaft screw extruder | Performing Operations; Transporting | 6 | Expired |
| US5876115A | Self-cleaning reactor/mixer for highly viscous and cohesive mixing materials | Performing Operations; Transporting | 6 | Expired |
| US5739252A | Thermoplastic polyurethaneurea elastomers | Chemistry; Metallurgy | 6 | Expired |
| US4617089A | Apparatus for discharging high viscosity media in chemical engineering | Performing Operations; Transporting | 5 | Expired |
| US4639507A | Process for the isolation of polyarylene sulphide | Chemistry; Metallurgy | 5 | Expired |
| US5728774A | Process for the continuous production of superabsorbent polymers from pan emulsions | Chemistry; Metallurgy | 5 | Expired |
| US4941748A | Extruder with ceramic processing unit | Performing Operations; Transporting | 4 | Expired |
| US5173466A | Catalyst for the reduction of nitrogen oxides from waste gases and a process for its production | Performing Operations; Transporting | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.