Scientific Drilling Controls
7Patents
0Active
7Granted
27Portfolio score
Filing activity: Oct 27, 1976 → Mar 24, 1980
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4181014A | Remote well signalling apparatus and methods | Fixed Constructions | 59 | Expired |
| US4325438A | Lengthening drill string containing an instrument | Fixed Constructions | 21 | Expired |
| US4157619A | Inclination and direction responsive apparatus | Physics | 20 | Expired |
| US4143721A | Change in length of drill string containing an instrument | Fixed Constructions | 16 | Expired |
| US4153120A | Change in length of drill string while instrument remains therein | Fixed Constructions | 15 | Expired |
| US4139950A | Direction responsive flux gate unit | Physics | 4 | Expired |
| US4178567A | Period-modulated voltage controlled oscillator | Fixed Constructions | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.