Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4478070 | Vacuum package tester and method | Earl W. Clifford, John M. Perhach | 1984-10-23 |
| 4385517 | Method and apparatus for measuring the permeability of a material | Earl W. Clifford | 1983-05-31 |