Issued Patents All Time
Showing 51–75 of 88 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857728 | Method and apparatus for reducing radioactive hazards in well boreholes | — | 1989-08-15 |
| 4857729 | Method of radioactive well logging | Larry L. Gadeken | 1989-08-15 |
| 4825073 | Method for determining depth of penetration of radioactive tracers in formation fractures | Larry L. Gadeken | 1989-04-25 |
| 4746801 | Method and apparatus for differentiating low porosity limestones from high porosity gas sands | Michael P. Smith | 1988-05-24 |
| 4737636 | Simultaneous neutron lifetime and oxygen activation and fluid sampling methods and apparatus to locate fluid flow in a cased well borehole | — | 1988-04-12 |
| 4717825 | Method and apparatus for anomalous radioactive deposition compensation in spectral gamma ray well logging | Larry L. Gadeken | 1988-01-05 |
| 4700300 | Indicating barehole rugosity as a function of the difference between shallow and deep log indices | Ward E. Schultz | 1987-10-13 |
| 4698499 | Quantitative evaluation of uranium ore zones | — | 1987-10-06 |
| 4691102 | Borehole compensation method and apparatus using variations in relative borehole components | Ward E. Schultz | 1987-09-01 |
| 4638161 | Epithermal neutron porosity measurement | Jerry L. Verbout | 1987-01-20 |
| 4631405 | Method and apparatus for dual-spaced fast/epithermal neutron porosity measurements | — | 1986-12-23 |
| 4625110 | Epithermal neutron porosity measurement | — | 1986-11-25 |
| 4625111 | Method and apparatus for pulsed neutron capture measurement of borehole conditions and formation hydrogen index | — | 1986-11-25 |
| 4605854 | Measurement of formation porosity using fast neutron spectroscopy | — | 1986-08-12 |
| 4585939 | Multi-function natural gamma ray logging system | Dan M. Arnold | 1986-04-29 |
| 4578580 | Gamma spectrum porosity measurement | — | 1986-03-25 |
| 4574193 | Method for logging fluid flow rate, water fraction, and/or salinity of water flowing into a well | Dan M. Arnold | 1986-03-04 |
| 4527058 | Earth formation density measurement from natural gamma ray spectral logs | — | 1985-07-02 |
| 4524272 | Behind casing water flow detector | Hans J. Paap | 1985-06-18 |
| 4504736 | Gamma ray spectral tool for borehole use | Tony M. Small, John Deaton | 1985-03-12 |
| 4493998 | Method for monitoring drilling materials for gamma ray activity | Dan M. Arnold, Ward E. Schultz | 1985-01-15 |
| 4492864 | Neutron well logging | Ward E. Schultz | 1985-01-08 |
| 4492863 | Determining elemental concentrations and formation matrix type from natural gamma ray spectral logs | — | 1985-01-08 |
| 4459479 | Determination of casing thickness using a natural gamma ray spectroscopy technique | Dan M. Arnold, Carl A. Robbins | 1984-07-10 |
| 4454420 | Neutron-inelastic gamma radiation well logging method and apparatus with background radiation accounted for | — | 1984-06-12 |