Drexelbrook Engineering Company
8Patents
0Active
8Granted
28Portfolio score
Filing activity: Nov 30, 1979 → Mar 26, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4485673A | Two-wire level measuring instrument | Physics | 56 | Expired |
| US5049878A | Two-wire compensated level measuring instrument | Physics | 29 | Expired |
| US5760309A | Ultrasonic method for material monitoring | Physics | 21 | Expired |
| US5987994A | Ultrasonic method for material monitoring | Physics | 19 | Expired |
| US4851831A | Two-wire level measuring instrument | Physics | 10 | Expired |
| US4363030A | Fail-safe instrument system | Physics | 9 | Expired |
| US4573040A | Fail-safe instrument system | Physics | 8 | Expired |
| US5307678A | Material level probe having crimp seal | Emerging Cross-Sectional Technologies | 7 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.