Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6945326 | Non-rotating cement wiper plugs | — | 2005-09-20 |
| 6209638 | Casing accessory equipment | — | 2001-04-03 |
| 6012529 | Downhole guide member for multiple casing strings | Michael R. Mikolajczyk | 2000-01-11 |
| 5095981 | Casing centralizer | — | 1992-03-17 |
| 4825947 | Apparatus for use in cementing a casing string within a well bore | — | 1989-05-02 |
| 4787244 | Well pipe or object depth indicator | — | 1988-11-29 |
| 4416547 | Portable proportioning device | — | 1983-11-22 |