Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6384369 | Liquid filter construction and methods | Eivind Stenersen, David B. Harder, John R. Hacker, Gerald D. Kiral, Kevin K. Socha | 2002-05-07 |
| 4692196 | Apparatus and method for wrapping an external tape support about a filter element assembly | Norman W. Ellegood, Joel L. Fritsche, John J. Groezinger, Keichi Ikeda | 1987-09-08 |
| 4626307 | Machine and method for assembling pleated filter material and a hollow core member | Paul Cherkas, Joel L. Fritsche, John J. Groezinger, Paul D. LaGorce | 1986-12-02 |