Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11400533 | Carbide wear surface and method of manufacture | Mahlon D. Dennis, Richard W. Lewis | 2022-08-02 |
| 10384284 | Carbide wear surface and method of manufacture | Mahlon D. Dennis, Richard W. Lewis | 2019-08-20 |
| 7712549 | Drilling tool | Mahlon D. Dennis, Eric M. Twardowski | 2010-05-11 |
| 6488103 | Drilling tool and method of using same | Mahlon D. Dennis, Eric M. Twardowski | 2002-12-03 |
| RE36673 | Viceband data set | Enrique Cheng-Quispe, Emanuel J. Fulcomer, Jr., George Malek, Shih Yung Tong | 2000-04-25 |
| 5722497 | Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces | Robert C. Gum, William D. Vanderford | 1998-03-03 |
| 5566779 | Insert for a drill bit incorporating a PDC layer having extended side portions | — | 1996-10-22 |
| 5498081 | Bearing assembly incorporating shield ring precluding erosion | Mahlon D. Dennis | 1996-03-12 |
| 5477034 | Method and apparatus for bonding PDC blanks | — | 1995-12-19 |
| 5458211 | Spade drill bit construction | Mark Hunt | 1995-10-17 |
| 5456329 | Bifurcated drill bit construction | Mark Hunt | 1995-10-10 |
| 5452843 | Method of brazing a composite bit using direct cooling means | — | 1995-09-26 |
| 5379854 | Cutting element for drill bits | — | 1995-01-10 |
| 5342129 | Bearing assembly with sidewall-brazed PCD plugs | Mahlon D. Dennis | 1994-08-30 |
| RE33380 | Voiceband data set | Enrique Cheng-Quispe, Emanuel J. Fulcomer, Jr., George Malek, Shih Yung Tong | 1990-10-09 |
| RE33368 | Data set network diagnostic system | Donald W. Darling, Stevan J. Thayer, Bonnie A. Zimmer | 1990-10-02 |
| 4419756 | Voiceband data set | Enrique Cheng-Quispe, Emanuel J. Fulcomer, Jr., George Malek, Shih Yung Tong | 1983-12-06 |
| 4398299 | Data set network diagnostic system | Donald W. Darling, Stevan J. Thayer, Bonnie A. Zimmer | 1983-08-09 |