David A. Hoffman
26Patents
6h-index
21Co-inventors
69Inventor score
Filing activity: Aug 1, 1977 → Apr 29, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4281677A | Supply valve for dual circuit systems | Emerging Cross-Sectional Technologies | 26 | Expired |
| US6503438B2 | Method and apparatus for balancing flowing conditions of laminar flowing materials | Performing Operations; Transporting | 21 | Expired |
| US4677777A | Price setting and display system for multiple unit merchandising machine | Physics | 15 | Expired |
| US6484870B2 | Dual belt conveyor system | Performing Operations; Transporting | 10 | Expired |
| US4284184A | Coin mechanism to merchandising machine interface | Physics | 8 | Expired |
| US10273056B2 | Fuel container system | Performing Operations; Transporting | 7 | Active |
| US10113990B2 | Microbial sensor system for the assessment of subsurface environments | Emerging Cross-Sectional Technologies | 5 | Active |
| US9199172B2 | System for software work events | Emerging Cross-Sectional Technologies | 3 | Active |
| US9327198B2 | Managing challenge events | Emerging Cross-Sectional Technologies | 2 | Active |
| US7247278B2 | Automated ground water monitoring and analysis system | Physics | 2 | Expired |
| US9327197B2 | Conducting challenge events | Emerging Cross-Sectional Technologies | 2 | Active |
| US4139238A | Vehicle braking systems | Performing Operations; Transporting | 2 | Expired |
| US10656116B2 | Microbial sensor system for the assessment of subsurface environments | Emerging Cross-Sectional Technologies | 1 | Active |
| US10878143B2 | Simulating selective participation of multiple events from a pool of qualified participants | Physics | 1 | Active |
| US9612232B2 | Static gel strength measurement apparatus and method | Physics | 1 | Active |
| US11226306B2 | Microbial sensor system for monitoring and imaging of an environment | Physics | 1 | Active |
| US10265614B2 | Managing challenge events | Emerging Cross-Sectional Technologies | 0 | Active |
| US4466528A | Apparatus for preventing circuit burn-out in multi-price merchandisers | Physics | 0 | Expired |
| US11231385B2 | Microbial sensor system for monitoring the environment and surfaces | Physics | 0 | Active |
| US11635406B2 | Microbial sensor system for the assessment of subsurface environments | Emerging Cross-Sectional Technologies | 0 | Active |
| US10265613B2 | Conducting challenge events | Emerging Cross-Sectional Technologies | 0 | Active |
| US9792527B2 | Automated slide comparator | Physics | 0 | Active |
| US12281296B2 | Electrochemical microbial sensor system and method of using same | Physics | 0 | Active |
| US11933758B2 | Methods and systems for monitoring microbial activity and communication in an environment | Physics | 0 | Active |
| US9764223B2 | Conducting challenge events | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.