Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856554 | Vacuum check valve and method of control | Donald L. Heffner, David A. Homan | 1989-08-15 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856554 | Vacuum check valve and method of control | Donald L. Heffner, David A. Homan | 1989-08-15 |