Numar
🏢 View company profile →26Patents
0Active
26Granted
33Portfolio score
Filing activity: Mar 11, 1986 → Jun 24, 2003
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5280243A | System for logging a well during the drilling thereof | Physics | 141 | Expired |
| US6268726A | Method and apparatus for nuclear magnetic resonance measuring while drilling | Physics | 125 | Expired |
| US4710713A | Nuclear magnetic resonance sensing apparatus and techniques | Physics | 120 | Expired |
| US4717877A | Nuclear magnetic resonance sensing apparatus and techniques | Physics | 96 | Expired |
| US4717876A | NMR magnet system for well logging | Physics | 93 | Expired |
| US5212447A | Apparatus and technique for NMR diffusion measurement | Physics | 90 | Expired |
| US4717878A | Nuclear magnetic resonance sensing apparatus and techniques | Physics | 88 | Expired |
| US5517115A | Efficient processing of NMR echo trains | Physics | 87 | Expired |
| US6111408A | Nuclear magnetic resonance sensing apparatus and techniques for downhole measurements | Physics | 75 | Expired |
| US5936405A | System and method for lithology-independent gas detection using multifrequency gradient NMR logging | Emerging Cross-Sectional Technologies | 73 | Expired |
| US5557200A | Nuclear magnetic resonance determination of petrophysical properties of geologic structures | Emerging Cross-Sectional Technologies | 71 | Expired |
| US5696448A | NMR system and method for formation evaluation using diffusion and relaxation log measurements | Physics | 69 | Expired |
| US5309098A | Nuclear magnetic resonance detection of geologic structures | Physics | 66 | Expired |
| US6005389A | Pulse sequences and interpretation techniques for NMR measurements | Physics | 63 | Expired |
| US6362619B1 | Method and apparatus for nuclear magnetic resonance measuring while drilling | Physics | 55 | Expired |
| US5412320A | Nuclear magnetic resonance determination of petrophysical properties of geologic structures | Emerging Cross-Sectional Technologies | 50 | Expired |
| US6051973A | Method for formation evaluation while drilling | Physics | 46 | Expired |
| US6583621B2 | Method and apparatus for nuclear magnetic resonance measuring while drilling | Physics | 42 | Expired |
| US6107796A | Method and apparatus for differentiating oil based mud filtrate from connate oil | Physics | 41 | Expired |
| US6242912A | System and method for lithology-independent gas detection using multifrequency gradient NMR logging | Emerging Cross-Sectional Technologies | 35 | Expired |
| US6023164A | Eccentric NMR well logging apparatus and method | Physics | 30 | Expired |
| US6825659B2 | Method and apparatus for nuclear magnetic resonance measuring while drilling | Physics | 29 | Expired |
| US6204663A | Pulse sequence and method for suppression of magneto-acoustic artifacts in NMR data | Physics | 27 | Expired |
| US6242913A | Method for formation evaluation while drilling | Physics | 18 | Expired |
| US6377042B1 | Method and apparatus for merging of NMR echo trains in the time domain | Physics | 15 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.