Issued Patents All Time
Showing 26–36 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5938804 | Reverse flow air filter arrangement and method | Dolan Bartels, John R. Hacker, Bruce Crenshaw, Don Harold, by Shirley A. Harold, legal representative | 1999-08-17 |
| 5897676 | Reverse flow air filter arrangement and method | Dolan Bartels, John R. Hacker, Bruce Crenshaw, Don Harold | 1999-04-27 |
| 5690712 | Reverse flow air filter arrangement and method | — | 1997-11-25 |
| 5613992 | Reverse flow air filter arrangement and method | — | 1997-03-25 |
| 5137308 | Air transfer system | Steven Scott Gieseke | 1992-08-11 |
| 5129685 | Connector system for air transfer ducts | — | 1992-07-14 |
| 5123795 | Quarter turn fastener | Steven Scott Gieseke | 1992-06-23 |
| 4974881 | Air transfer system | Steven Scott Gieseke | 1990-12-04 |
| 4856826 | Air transfer system | Steven Scott Gieseke | 1989-08-15 |
| 4720292 | Cylindrical air filter with lightweight housing and radially directed seal | Steven Scott Gieseke | 1988-01-19 |
| 4699639 | Air-intake, moisture-eliminator duct apparatus | Steven Scott Gieseke | 1987-10-13 |