Donald E. Hoffman
46Patents
13h-index
17Co-inventors
78Inventor score
Filing activity: Aug 20, 1984 → Feb 7, 2017
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5234185A | Unitary pipe clamp and assembly | Performing Operations; Transporting | 143 | Expired |
| US6278764A | High efficiency replicated x-ray optics and fabrication method | Physics | 112 | Expired |
| US8591377B1 | Multi-speed automatic transmission | Mechanical Engineering; Lighting; Heating | 83 | Active |
| US8382631B2 | Accessory drive and engine restarting system | Emerging Cross-Sectional Technologies | 73 | Active |
| US8376889B2 | Transmission producing continuously variable speed ratios | Mechanical Engineering; Lighting; Heating | 72 | Active |
| US6958028B2 | Ranged dual clutch transmission for motor vehicles | Emerging Cross-Sectional Technologies | 52 | Expired |
| US9175748B2 | Multi-speed transmission | Mechanical Engineering; Lighting; Heating | 47 | Active |
| US8257217B2 | Infinitely variable transmission with offset output shaft | Mechanical Engineering; Lighting; Heating | 30 | Active |
| US8257216B2 | Infinitely variable transmission | Mechanical Engineering; Lighting; Heating | 29 | Active |
| US5101883A | Method of assembly of single and multi-zone vehicle heating and a/c systems | Performing Operations; Transporting | 25 | Expired |
| US6572483B1 | Spinnable swing assembly | Human Necessities | 22 | Expired |
| US4768545A | Actuator for air conditioning system | Emerging Cross-Sectional Technologies | 22 | Expired |
| US5202086A | Aramid fabric for garments of improved comfort | Emerging Cross-Sectional Technologies | 18 | Expired |
| US6122983A | Shift device for a manual transmission | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4828018A | Motor vehicle air conditioning and heating system with bi-level mode | Performing Operations; Transporting | 11 | Expired |
| US4549605A | Single inlet/outlet-tank U-shaped tube heat exchanger | Emerging Cross-Sectional Technologies | 10 | Expired |
| US10247280B2 | Four planetary-gearset step-ratio automatic transmission | Mechanical Engineering; Lighting; Heating | 10 | Active |
| US5163505A | Heater core retaining system | Emerging Cross-Sectional Technologies | 9 | Expired |
| US9822856B2 | Multi-speed transmission | Mechanical Engineering; Lighting; Heating | 8 | Active |
| US5263893A | Air distribution housing with integrally formed internal bearing pins and its method of manufacture | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4683913A | Rotary air valve seal arrangement | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4711158A | Linear motion actuator with spring centering means | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US6453624B1 | Playset tower assembly arrangement | Fixed Constructions | 6 | Expired |
| US5305593A | Process for making spun yarn | Emerging Cross-Sectional Technologies | 6 | Expired |
| US9217494B2 | Multi-speed transmission | Mechanical Engineering; Lighting; Heating | 5 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.