Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5957203 | Ultra-high temperature stable gels | Richard D. Hutchins, Hoai T. Dovan | 1999-09-28 |
| 5762141 | Ultra-high temperature stable gels | Richard D. Hutchins, Hoai T. Dovan | 1998-06-09 |
| 5617920 | Method for modifying gelation time of organically crosslinked, aqueous gels | Hoai T. Dovan, Richard D. Hutchins | 1997-04-08 |
| 5486312 | High temperature stable gels | Hoai T. Dovan, Richard D. Hutchins | 1996-01-23 |
| 5335733 | Method for delaying gelation of a gelable polymer composition injected into a subterranean formation | Hoai T. Dovan, Richard D. Hutchins | 1994-08-09 |
| 5268112 | Gel-forming composition | Richard D. Hutchins, Hoai T. Dovan | 1993-12-07 |
| 5246073 | High temperature stable gels | Hoai T. Dovan, Richard D. Hutchins | 1993-09-21 |
| 5203834 | Foamed gels having selective permeability | Richard D. Hutchins, Hoai T. Dovan | 1993-04-20 |
| 5145012 | Method for selectively reducing subterranean water permeability | Richard D. Hutchins, Hoai T. Dovan | 1992-09-08 |
| 4796700 | Process for retarding fluid flow | Roger C. Zillmer | 1989-01-10 |
| 4673038 | Gel and process for preventing carbon dioxide break through | Roger C. Zillmer | 1987-06-16 |
| 4665986 | Gel and method for reducing steam channeling | — | 1987-05-19 |
| 4665987 | Prepartially crosslinked gel for retarding fluid flow | Chji-Shyoung Chiou | 1987-05-19 |
| 4643255 | Gel and process for preventing loss of circulation, and combination process for enhanced recovery | Roger C. Zillmer | 1987-02-17 |
| 4501324 | Method for identifying the source of an oil | E. Reinold Fett, Harold J. Bickford | 1985-02-26 |
| 4413680 | Permeability reduction in subterranean reservoirs | Hoai T. Dovan, Richard D. Hutchins | 1983-11-08 |
| 4332297 | Selectively controlling fluid flow through the higher permeability zones of subterranean reservoirs | — | 1982-06-01 |