Bertel Birker
4Patents
4h-index
5Co-inventors
47Inventor score
Filing activity: Aug 24, 1976 → Jul 6, 1998
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4159646A | Apparatus for measuring the flow quantity or associated parameters of a liquid with two ultrasonic transducers | Physics | 25 | Expired |
| US6138517A | Mass flowmeter with bidirectionally wound oscillation detector | Physics | 11 | Expired |
| US4159647A | Apparatus for measuring the flow quantity or associated parameters of a liquid with two ultrasonic transducers | Physics | 10 | Expired |
| US4097719A | Control system for charging and discharging an electric storage heater | Physics | 6 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.