| 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 |
$27,032,000 |
| 4579669 |
High temperature drilling fluids based on sulfonated thermoplastic polymers |
Dennis G. Peiffer, Robert D. Lundberg |
1986-04-01 |
$15,739,000 |
| 4540496 |
Intramolecular polymer complexes - viscosifiers for high ionic strength drilling fluids |
Dennis G. Peiffer, Robert D. Lundberg, S. Richard Turner |
1985-09-10 |
$27,764,000 |
| 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 |
$34,335,000 |
| 4510998 |
Fluid loss additive for well drilling |
Dennis G. Peiffer, Robert D. Lundberg |
1985-04-16 |
$44,664,000 |
| 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 |
$39,229,000 |
| 4465801 |
Interfacial viscosification of aqueous system utilizing sulfonated ionomers |
Dennis G. Peiffer, Robert D. Lundberg |
1984-08-14 |
$36,657,000 |
| 4464269 |
Additive composition for release of stuck drill pipe |
Patricia C. Matthews |
1984-08-07 |
$26,281,000 |
| 4447338 |
Drilling mud viscosification agents based on sulfonated ionomers |
Robert D. Lundberg, Charles P. O'Farrell, Henry S. Makowski |
1984-05-08 |
$69,094,000 |
| 4442011 |
Drilling mud viscosification agents based on sulfonated ionomers |
Warren A. Thaler, Robert D. Lundberg, Joseph Wagensommer |
1984-04-10 |
$13,845,000 |
| 4436638 |
Additive composition for release of stuck drill pipe |
Patricia C. Matthews |
1984-03-13 |
$16,673,000 |
| 4427564 |
Additive composition for release of stuck drill pipe |
Darrell W. Brownawell, Antonio Gutierrez, Patricia C. Matthews |
1984-01-24 |
$14,151,000 |
| 4427812 |
Interfacial viscosification of salt water systems utilizing sulfonated ionomers |
Dennis G. Peiffer, Robert D. Lundberg |
1984-01-24 |
$14,151,000 |
| 4426473 |
Interfacial viscosification of aqueous acid systems utilizing sulfonated ionomers |
Dennis G. Peiffer, Robert D. Lundberg |
1984-01-17 |
$13,816,000 |
| 4425462 |
Drilling fluids based on sulfonated elastomeric polymers |
S. Richard Turner, Robert D. Lundberg |
1984-01-10 |
$10,591,000 |
| 4425455 |
Drilling fluids based on powdered sulfonated thermoplastic polymers |
S. Richard Turner, Robert D. Lundberg, Dennis G. Peiffer |
1984-01-10 |
$10,591,000 |
| 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 |
$10,591,000 |
| 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 |
$10,591,000 |
| 4382002 |
Drilling fluids containing an additive composition |
Darrell W. Brownawell, Antonio Gutierrez |
1983-05-03 |
$51,611,000 |
