Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7338607 | Filter canister, system containing filter canister, and their use | Harold B. Dreyer | 2008-03-04 |
| 6485229 | Containment/exclusion boom and methods of using the same | William Gunderson, Harold B. Dreyer | 2002-11-26 |
| 4297056 | Method and H-pile tip for driving piles in permafrost | — | 1981-10-27 |