Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5018792 | Impact ripper apparatus with linear reciprocating ram | Charles Crowell | 1991-05-28 |
| 4959915 | Impact bucket apparatus | Brent C. Bargfrede | 1990-10-02 |
| 4834461 | Control system for a multiple shank impact ripper | Jerry D. Fidler, John J. Krone | 1989-05-30 |
| 4703838 | Recoil damper for a reciprocating member | Delwin E. Cobb | 1987-11-03 |
| 4679857 | Mounting frame for linear impact ripper assembly | Jerry D. Fidler, Brian D. Jensen | 1987-07-14 |
| 4453772 | Modular impact ripper assembly | — | 1984-06-12 |
| 4422650 | Flexible seal assembly | Harold L. Reinsma, Albert L. Woody | 1983-12-27 |
| 4379595 | Ripper with offset impacting means and slotted shank | Steven D. Jones, Albert L. Woody | 1983-04-12 |
| 4345768 | Self pumping seal for a reciprocating member | — | 1982-08-24 |
| 4240642 | Belleville spring-loaded crescent seal | — | 1980-12-23 |
| 4189158 | Gas loaded face seal | — | 1980-02-19 |