Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856554 | Vacuum check valve and method of control | Dennis G. Merical, David A. Homan | 1989-08-15 |
| 4763689 | Vacuum check valve | Donald L. Parker | 1988-08-16 |
| 4756333 | Vacuum check valve | Dennis G. Merical | 1988-07-12 |
| 4750517 | Vacuum check valve | Donald L. Parker | 1988-06-14 |
| 4750516 | Vacuum check valve | Donald L. Parker | 1988-06-14 |
| 4724867 | Vacuum check valve | William H. Gillespie, III, David A. Homan, Dennis G. Merical, James W. Miller, Donald L. Parker | 1988-02-16 |
| 4628959 | Vacuum check valve | Donald L. Parker | 1986-12-16 |