Ivan Hellquist
7Patents
6h-index
5Co-inventors
56Inventor score
Filing activity: Feb 26, 1976 → Jul 3, 1996
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4887638A | Regulator | Emerging Cross-Sectional Technologies | 27 | Expired |
| US4926855A | Respirator | Human Necessities | 18 | Expired |
| US5080414A | Locking device for attaching a gas cylinder in a portable cylinder holder | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US4031887A | Breathing apparatus providing pressure compensation | Performing Operations; Transporting | 9 | Expired |
| US4141353A | Warning arrangement for breathing apparatus for divers | Emerging Cross-Sectional Technologies | 7 | Expired |
| US5813400A | Breathing apparatus | Human Necessities | 6 | Expired |
| US4060076A | Breathing apparatus incorporating depth compensation | Emerging Cross-Sectional Technologies | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.