Henry Wohltjen
25Patents
12h-index
20Co-inventors
81Inventor score
Filing activity: Oct 16, 1975 → Apr 23, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4312228A | Methods of detection with surface acoustic wave and apparati therefor | Physics | 145 | Expired |
| US4759210A | Apparatus for gas-monitoring and method of conducting same | Physics | 109 | Expired |
| US8279063B2 | Personnel location and monitoring system and method for enclosed facilities | Physics | 26 | Active |
| US4572900A | Organic semiconductor vapor sensing method | Physics | 24 | Expired |
| US4513280A | Method and apparatus for the detection of toxicants | Physics | 22 | Expired |
| US6221673A | Materials, method and apparatus for detection and monitoring of chemical species | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5550062A | Method and apparatus for chemical detection by pyrolysis | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4513087A | Reversible optical waveguide vapor sensor | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4452624A | Method for bonding insulator to insulator | Chemistry; Metallurgy | 15 | Expired |
| US4636767A | Mixed semiconductor film device for monitoring gases | Physics | 15 | Expired |
| US7347974B1 | Materials, method and apparatus for detection and monitoring of chemical species | Physics | 12 | Expired |
| USH477H | Monolayer-forming substituted phthalocyanine compounds and method of | General | 12 | Active |
| US9478118B2 | Hand hygiene complicance confirmation system | Physics | 11 | Active |
| US4078551A | Electronic sphygmomanometer | Human Necessities | 8 | Expired |
| US4438203A | Method and apparatus for determination of lubricant stability | Physics | 8 | Expired |
| USH406H | Organophosphorus selective ion mobility spectrometer | General | 6 | Active |
| US7449050B2 | System, apparatus and method for concentrating chemical vapors | Emerging Cross-Sectional Technologies | 5 | Active |
| US7845206B2 | System, apparatus and method for dispensing chemical vapor | Physics | 3 | Active |
| US7484399B2 | System, apparatus and method for dispensing chemical vapor | Physics | 3 | Active |
| US7240535B2 | Method and apparatus for gas measurement at substantially constant pressure | Physics | 2 | Expired |
| US8925653B2 | Apparatus and method for high pressure abrasive fluid injection | Fixed Constructions | 2 | Active |
| US9291038B2 | Apparatus and method for high pressure abrasive fluid injection | Fixed Constructions | 2 | Active |
| US12235235B2 | System and method for gas concentration measurement | Physics | 0 | Active |
| US8349260B2 | System and method for limiting sensor exposure to ozone | Physics | 0 | Active |
| US9638669B2 | Portable fuel dilution meter and method | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.