David M. Chace
29Patents
8h-index
38Co-inventors
75Inventor score
Filing activity: Jan 22, 1981 → Oct 9, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8074737B2 | Wireless perforating gun initiation | Fixed Constructions | 94 | Active |
| US5606124A | Apparatus and method for determining the gravitational orientation of a well logging instrument | Fixed Constructions | 38 | Expired |
| US6601461B2 | Multi-phase compensated spinner flow meter | Physics | 14 | Expired |
| US5404752A | Method for measuring the velocity of water flow through nested conduits | Fixed Constructions | 13 | Expired |
| US4430567A | Method and apparatus for neutron induced gamma ray logging for direct porosity identification | Physics | 12 | Expired |
| US5949069A | Method and apparatus for measuring volumetric water flow rates in highly inclined wellbores | Physics | 12 | Expired |
| US8964504B2 | Method and apparatus for evaluating a cemented borehole casing | Fixed Constructions | 10 | Active |
| US7372018B2 | Determination of gas pressure and saturation simultaneously | Physics | 10 | Expired |
| US7554081B2 | Method and apparatus for determining silicon content of the earth formations in cased well bores | Physics | 8 | Active |
| US7227129B2 | Flowshot technique | Physics | 7 | Expired |
| US4612439A | Method and apparatus for natural gamma ray well logging | Physics | 6 | Expired |
| US7186971B2 | Flowshot technique | Physics | 6 | Expired |
| US8978481B2 | Simultaneous ultrasonic cross-correlation and transit time measurements for multiphase flow rate analysis | Physics | 6 | Active |
| US10585209B2 | Gamma ray spectra contrast sharpening | Physics | 5 | Active |
| US9086500B2 | Apparatus and method for pulsed neutron measurement | Physics | 3 | Active |
| US9261622B2 | Elemental concentration determination using neutron-induced activation gamma radiation | Physics | 3 | Active |
| US9696454B1 | Identifying weighting material sag with pulsed neutron logs | Physics | 2 | Active |
| US10520641B2 | Gamma calibration | Physics | 2 | Active |
| US9599743B2 | Density measurements using detectors on a pulsed neutron measurement platform | Physics | 1 | Active |
| US11906690B2 | Obtaining inelastic spectra free of detector born gamma rays induced by neutrons | Physics | 1 | Active |
| US10324224B2 | Elemental concentration determination using neutron-induced activation gamma radiation | Physics | 1 | Active |
| US9885802B2 | Downhole cement evalution using pulsed neutron measurements | Fixed Constructions | 1 | Active |
| US8903658B2 | Apparatus and method for measuring downhole fluid composition and properties | Physics | 1 | Active |
| US8502135B2 | Method for through-casing 3-phase saturation determination | Physics | 1 | Active |
| US10725200B2 | Water saturation determination using an oxygen estimate and formation lithology | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.