NP Industries, Inc.
6Patents
0Active
6Granted
28Portfolio score
Filing activity: Jan 12, 1979 → Oct 23, 1980
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4254482A | Echo location system which provides for measuring liquid level and flow rate and flow volume of flowing liquids | Electricity | 15 | Expired |
| US4202211A | Flow measuring system | Physics | 14 | Expired |
| US4326173A | Digital phase locked loop frequency control system | Physics | 13 | Expired |
| US4217777A | Flow measuring system | Physics | 9 | Expired |
| US4317184A | Dual slope compensation apparatus | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4272761A | Operations control system | Physics | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.