Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9375691 | Method and apparatus for centrifugal blending system | Calvin L. Stegemoeller, Chad Heitman, Stanley V. Stephenson | 2016-06-28 |
| 8882428 | Proppant transfer system | Mark Fikes, John Heaton, Ed B. Hagan, Robert Douglas Hayworth | 2014-11-11 |
| 7621328 | Methods of pumping fluids having different concentrations of particulate with different concentrations of hydratable additive to reduce pump wear and maintenance in the forming and delivering of a treatment fluid into a wellbore | Leonard R. Case, Michael Segura, Harold Grayson Walters, Jason E. Bryant, Jonn Thompson +3 more | 2009-11-24 |
| 7621329 | Methods of pumping fluids having different concentrations of particulate at different average bulk fluid velocities to reduce pump wear and maintenance in the forming and delivering of a treatment fluid into a wellbore | Leonard R. Case, Michael Segura, Harold Grayson Walters, Jason E. Bryant, Jonn Thompson +3 more | 2009-11-24 |
| 7353875 | Centrifugal blending system | Stan Stephenson, Max L. Phillippi | 2008-04-08 |
| 5320425 | Cement mixing system simulator and simulation method | Stanley V. Stephenson, Charles D. Donaghe, Karl W. Blanchard, Neil A. Pritchard, Jerry N. Browning +1 more | 1994-06-14 |
| 5026168 | Slurry mixing apparatus | Leslie N. Berryman, Max L. Phillippi, David A. Prucha, Vincent G. Reidenbach, Stanley V. Stephenson | 1991-06-25 |
| 4989987 | Slurry mixing apparatus | Leslie N. Berryman, Max L. Phillippi, David A. Prucha, Vincent G. Reidenbach, Stanley V. Stephenson | 1991-02-05 |
| 4930576 | Slurry mixing apparatus | Leslie N. Berryman, Max L. Phillippi, David A. Prucha, Vincent G. Reidenbach, Stanley V. Stephenson | 1990-06-05 |
| 4701095 | Transportable material conveying apparatus | Leslie N. Berryman, Gail F. Davis | 1987-10-20 |
| 4427133 | Additive material metering system with weighing means | Gerald C. Kierbow | 1984-01-24 |
| 4410106 | Additive material metering system with pneumatic discharge | Gerald C. Kierbow | 1983-10-18 |
| 4265266 | Controlled additive metering system | Gerald C. Kierbow, Harvard L. Tomlinson, Stephen F. Crain | 1981-05-05 |
| 4209278 | Chassis having articulated frame | Bob D. Cooper, Richard L. Krivy | 1980-06-24 |