Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5710107 | Environmentally safe drilling fluid | — | 1998-01-20 |
| 5403820 | Environmentally safe water base drilling fluid | — | 1995-04-04 |
| 4584386 | Alkylthiomethyl substituted mono-oxazolines | Antonio Gutierrez, Darrell W. Brownawell, Stanley J. Brois | 1986-04-22 |
| 4579669 | High temperature drilling fluids based on sulfonated thermoplastic polymers | Dennis G. Peiffer, Robert D. Lundberg | 1986-04-01 |
| 4540496 | Intramolecular polymer complexes - viscosifiers for high ionic strength drilling fluids | Dennis G. Peiffer, Robert D. Lundberg, S. Richard Turner | 1985-09-10 |
| 4525522 | Drilling fluids based on sulfonated thermoplastic polymers having improved low temperature rheological properties | S. Richard Turner, Dennis G. Peiffer, Robert D. Lundberg | 1985-06-25 |
| 4510998 | Fluid loss additive for well drilling | Dennis G. Peiffer, Robert D. Lundberg | 1985-04-16 |
| 4508628 | Fast drilling invert emulsion drilling fluids | Jay P. Simpson, Harry L. Dearing, Jr. | 1985-04-02 |
| 4491524 | Lubricating additive for drilling muds | Antonio Gutierrez, Darrell W. Brownawell, Stanley J. Brois | 1985-01-01 |
| 4478727 | Sodium styrene sulfonate-co-sodium-n-(4-sulfophenyl)-maleimide- an improved viscosity control additive | S. Richard Turner, Warren A. Thaler | 1984-10-23 |
| 4465801 | Interfacial viscosification of aqueous system utilizing sulfonated ionomers | Dennis G. Peiffer, Robert D. Lundberg | 1984-08-14 |
| 4464269 | Additive composition for release of stuck drill pipe | Patricia C. Matthews | 1984-08-07 |
| 4447338 | Drilling mud viscosification agents based on sulfonated ionomers | Robert D. Lundberg, Charles P. O'Farrell, Henry S. Makowski | 1984-05-08 |
| 4442011 | Drilling mud viscosification agents based on sulfonated ionomers | Warren A. Thaler, Robert D. Lundberg, Joseph Wagensommer | 1984-04-10 |
| 4436638 | Additive composition for release of stuck drill pipe | Patricia C. Matthews | 1984-03-13 |
| 4427564 | Additive composition for release of stuck drill pipe | Darrell W. Brownawell, Antonio Gutierrez, Patricia C. Matthews | 1984-01-24 |
| 4427812 | Interfacial viscosification of salt water systems utilizing sulfonated ionomers | Dennis G. Peiffer, Robert D. Lundberg | 1984-01-24 |
| 4426473 | Interfacial viscosification of aqueous acid systems utilizing sulfonated ionomers | Dennis G. Peiffer, Robert D. Lundberg | 1984-01-17 |
| 4425462 | Drilling fluids based on sulfonated elastomeric polymers | S. Richard Turner, Robert D. Lundberg | 1984-01-10 |
| 4425455 | Drilling fluids based on powdered sulfonated thermoplastic polymers | S. Richard Turner, Robert D. Lundberg, Dennis G. Peiffer | 1984-01-10 |
| 4425461 | Drilling fluids based on a mixture of a sulfonated thermoplastic polymer and a sulfonated elastomeric polymer | S. Richard Turner, Robert D. Lundberg, Warren A. Thaler, Dennis G. Peiffer | 1984-01-10 |
| 4425463 | Drilling fluids based on a mixture of sulfonated thermoplastic polymer and an amine-treated clay | S. Richard Turner, Robert D. Lundberg, Warren A. Thaler, Dennis G. Pfeiffer | 1984-01-10 |
| 4382002 | Drilling fluids containing an additive composition | Darrell W. Brownawell, Antonio Gutierrez | 1983-05-03 |