Issued Patents All Time
Showing 25 most recent of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5948735 | Use of breaker chemicals in gelled hydrocarbons | Cruise K. Jones, Fati Malekahmadi | 1999-09-07 |
| 5906966 | Drilling mud additives and in adding viscosification additives to oil-based drilling muds | Warren A. Thaler, Cruise K. Jones, David B. Acker | 1999-05-25 |
| 5204183 | Composition comprising polymer encapsulant for sealing layer encapsulated substrate | Lee A. McDougall, Pacifico V. Manalastas, Evelyn N. Drake | 1993-04-20 |
| 5192615 | Composition comprising encapsulated substrate and thermoplastic polymer overcoating | Lee A. McDougall, Pacifico V. Manalastas, Evelyn N. Drake | 1993-03-09 |
| 5187011 | Composition comprising encapsulated substrate with thermoplastic polymer overcoating | Pacifico V. Manalastas, Evelyn N. Drake, Edward N. Kresge, Warren A. Thaler, Lee A. McDougall +2 more | 1993-02-16 |
| 5110486 | Breaker chemical encapsulated with a crosslinked elastomer coating | Pacifico V. Manalastas, Evelyn N. Drake, Edward N. Kresge, Warren A. Thaler, Lee A. McDougall +2 more | 1992-05-05 |
| 5102559 | Encapsulated breaker chemical with a multi-coat layer urea | Lee A. McDougall, Pacifico V. Manalastas, Evelyn N. Drake | 1992-04-07 |
| 5102558 | Encapsulated breaker chemical | Lee A. McDougall, Pacifico V. Manalastas, Evelyn N. Drake | 1992-04-07 |
| 5073276 | Polymer article of manufacture | Lee A. McDougall, John R. Walker, John Robert Stockwell | 1991-12-17 |
| 5007481 | Method of treating subterranean formations using a non-damaging fracturing fluid | Dennis A. Williams, Roger Horton, Robert E. Chumley | 1991-04-16 |
| 4978461 | Low and high temperature drilling fluids based on sulfonated terpolymer ionomers | Dennis G. Peiffer, Robert D. Lundberg, Eugen R. Werlein | 1990-12-18 |
| H837 | Drilling fluids based on polymer complexes | Dennis G. Peiffer, Robert D. Lundberg, Lawrence P. Sedillo | 1990-11-06 |
| 4964466 | Hydraulic fracturing with chlorine dioxide cleanup | Dennis A. Williams, Roger Horton | 1990-10-23 |
| H495 | Drilling fluids based on hydrocarbon soluble polyampholytes | Dennis G. Peiffer, Robert D. Lundberg, Lawrence P. Sedillo | 1988-07-05 |
| 4739834 | Controlled hydraulic fracturing via nonaqueous solutions containing low charge density polyampholytes | Dennis G. Peiffer, Robert D. Lundberg, Lawrence P. Sedillo | 1988-04-26 |
| 4738897 | Polymer article and its use for controlled introduction of reagent into a fluid | Lee A. McDougall, John A. Haslegrave | 1988-04-19 |
| 4683952 | Fluid loss control in oil field cements | Dennis G. Peiffer, Robert D. Lundberg, Lawrence P. Sedillo | 1987-08-04 |
| 4670166 | Polymer article and its use for controlled introduction of reagent into a fluid | Lee A. McDougall, John A. Haslegrave | 1987-06-02 |
| 4660645 | Method for controlled introduction of reagent into a liquid | Lee A. McDougall | 1987-04-28 |
| 4659750 | Fluid loss control in oil field cements | Lawrence P. Sedillo, Robert C. Portnoy | 1987-04-21 |
| 4627926 | Thermally stable borehole fluids | Dennis G. Peiffer, Robert D. Lundberg, Lawrence P. Sedillo | 1986-12-09 |
| 4626285 | Fluid loss control in oil field cements | Dennis G. Peiffer, Robert D. Lundberg, Lawrence P. Sedillo | 1986-12-02 |
| 4615393 | Hydrocarbon soluble polymer complexes useful as viscosifiers in fracturing operations | Lawrence P. Sedillo, Dennis G. Peiffer, Robert D. Lundberg | 1986-10-07 |
| 4614235 | Use of mono and polyalkylene glycol ethers as agents for the release of differentially stuck drill pipe | Ivian G. Keener, Robert C. Portnoy, Daniel Frederick Fehler, Kenneth W. Pober | 1986-09-30 |
| 4579671 | Hydrocarbon soluble polymer complexes useful as viscosifiers in fracturing operations | Robert D. Lundberg, Dennis G. Peiffer, Lawrence P. Sedillo | 1986-04-01 |