Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9267359 | Method and apparatus for interrogating a subterranean annulus | John Edward Smaardyk, Donald K. Steinman | 2016-02-23 |
| 8878126 | Method for inspecting a subterranean tubular | John Edward Smaardyk, Donald K. Steinman | 2014-11-04 |
| 8754362 | Method for detecting fractures and perforations in a subterranean formation | John Edward Smaardyk, Donald K. Steinman | 2014-06-17 |
| 4810876 | Logging apparatus and method for determining absolute elemental concentrations of subsurface formations | Peter Wraight, Darwin V. Ellis, Hubert D. Scott, Jeffrey S. Schweitzer, James A. Grau | 1989-03-07 |
| 4507554 | Method and apparatus for determining borehole and formation constituents | William B. Nelligan | 1985-03-26 |
| 4394574 | Methods and apparatus for constituent analysis of earth formations | James A. Grau | 1983-07-19 |
| 4317993 | Methods and apparatus for constituent analysis of earth formations | William B. Nelligan | 1982-03-02 |
| 4284886 | Random pulsing of neutron source for inelastic neutron scattering gamma ray spectroscopy | — | 1981-08-18 |
| 4232220 | Background subtraction system for pulsed neutron logging of earth boreholes | — | 1980-11-04 |