Issued Patents All Time
Showing 51–75 of 79 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6057424 | Method and apparatus to synthesize DNA and DNA-like molecular structures by applying electric fields to gaseous mixtures of chemical reactants containing template particulate matter | — | 2000-05-02 |
| 6031381 | Electrical voltages and resistances measured to inspect metallic cased wells and pipelines | Steven Thomas Momii | 2000-02-29 |
| 6025721 | Determining resistivity of a formation adjacent to a borehole having casing by generating constant current flow in portion of casing and using at least two voltage measurement electrodes | — | 2000-02-15 |
| 5894897 | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells | — | 1999-04-20 |
| 5836409 | Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys | — | 1998-11-17 |
| 5717334 | Methods and apparatus to produce stick-slip motion of logging tool attached to a wireline drawn upward by a continuously rotating wireline drum | Steven Thomas Momii | 1998-02-10 |
| 5636418 | Environmentally degradable urns for burial of human cremation ashes in terrestrial cemeteries | Thomas Vail | 1997-06-10 |
| 5637972 | Rotor position encoder having features in decodeable angular positions | Steven P. Randall, David M. Sudgen, Geoffrey T. Brown | 1997-06-10 |
| 5633590 | Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present | — | 1997-05-27 |
| 5615747 | Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys | — | 1997-04-01 |
| 5570024 | Determining resistivity of a formation adjacent to a borehole having casing using multiple electrodes and with resistances being defined between the electrodes | — | 1996-10-29 |
| 5551521 | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells | — | 1996-09-03 |
| 5260661 | Calibrating and compensating influence of casing thickness variations on measurements of low frequency A.C. magnetic fields within cased boreholes to determine properties of geological formations | — | 1993-11-09 |
| 5239733 | Temporally degradable urns for burial of human cremation ashes in cemeteries | Thomas Vail | 1993-08-31 |
| 5223794 | Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps | — | 1993-06-29 |
| 5187440 | Measuring resistivity changes from within a first cased well to monitor fluids injected into oil bearing geological formations from a second cased well while passing electrical current between the two cased wells | — | 1993-02-16 |
| 5075626 | Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences | — | 1991-12-24 |
| 5065100 | Measurement of in-phase and out-of-phase components of low frequency A.C. magnetic fields within cased boreholes to measure geophysical properties of geological formations | — | 1991-11-12 |
| 5043669 | Methods and apparatus for measurement of the resistivity of geological formations from within cased wells in presence of acoustic and magnetic energy sources | — | 1991-08-27 |
| 5043668 | Methods and apparatus for measurement of electronic properties of geological formations through borehole casing | — | 1991-08-27 |
| 4901023 | Methods and apparatus for measurement of low frequency a.c. magnetic fields within cased boreholes to determine properties of geological formations | — | 1990-02-13 |
| 4882542 | Methods and apparatus for measurement of electronic properties of geological formations through borehole casing | — | 1989-11-21 |
| 4820989 | Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes | — | 1989-04-11 |
| 4804918 | Dual excitation acoustic paramagnetic logging tool | — | 1989-02-14 |
| 4792757 | Oil well logging tools measuring paramagnetic logging effect for use in open boreholes and cased well bores | Paul B. Schwinberg | 1988-12-20 |