Ralph M. Hoffmann
15Patents
6h-index
6Co-inventors
59Inventor score
Filing activity: Oct 29, 1979 → Jun 17, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4297090A | Rotary expansion power unit with valve disc connected to crankshaft | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4728270A | Apparatus and method for replacing apex seals in a rotary device | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US4721445A | Outer envelope trochoidal rotary device having a rotor assembly having peripheral reliefs | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4382755A | Driveshaft arrangement for trochoidal rotary device | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US5046932A | Rotary epitrochoidal compressor | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4895222A | Constant level oiler | Physics | 8 | Expired |
| US4400145A | Driveshaft arrangement for a rotary expansible chamber device | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US4884661A | Center-fill top cover for oilers | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US9306331B2 | Self-aligning connector for data and/or power transmission | Electricity | 3 | Active |
| US4551083A | Dual rotor gear assembly for trochoidal rotary device | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US4827983A | Swiveling mount for the outlet of a pressure vessel | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4911043A | Apparatus and method for milling a trochoidal rotor | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4778362A | Outer envelope trochoidal rotary device having a two piece rotor assembly | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US4735560A | Seal assembly for a rotary device | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US9605472B2 | Connecting means comprising a hatch and a bellows | Fixed Constructions | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.