Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8267185 | Circulated heated transfer fluid systems used to treat a subsurface formation | Ernesto Rafael Fonseca Ocampos, James J. Venditto, Renfeng Richard Cao, Ronald Marshall Bass, Scott Vinh Nguyen +2 more | 2012-09-18 |
| 8238730 | High voltage temperature limited heaters | Chester Ledlie Sandberg, Harold J. Vinegar, Christopher Harris, Fredrick Gordon Carl, Jr. | 2012-08-07 |
| 8224163 | Variable frequency temperature limited heaters | Chester Ledlie Sandberg, Harold J. Vinegar, Christopher Harris, Fredrick Gordon Carl, Jr. | 2012-07-17 |
| 8224164 | Insulated conductor temperature limited heaters | Chester Ledlie Sandberg, Harold J. Vinegar, Christopher Harris, Fredrick Gordon Carl, Jr. | 2012-07-17 |
| 8200072 | Temperature limited heaters for heating subsurface formations or wellbores | Harold J. Vinegar, Chester Ledlie Sandberg, Christopher Harris, James Louis Menotti, Fredrick Gordon Carl, Jr. | 2012-06-12 |
| 7703513 | Wax barrier for use with in situ processes for treating formations | Harold J. Vinegar, Ernest E. Carter, Jr., Taixu Bai, Mohamad Fereydoon Khoda Verdian | 2010-04-27 |
| 7121341 | Conductor-in-conduit temperature limited heaters | Harold J. Vinegar, Chester Ledlie Sandberg, Christopher Harris, Fredrick Gordon Carl, Jr. | 2006-10-17 |
| 4659230 | Mixing element for compounds and extruding machinery | Philip C. Lewellen | 1987-04-21 |
| 4657499 | Screw extruder apparatus adapted for mixing additive fluids | Philip C. Lewellen | 1987-04-14 |