Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6104013 | Induction sealing covers with tabs | — | 2000-08-15 |
| 6035607 | Apparatus and system for on-the-go filling and sealing | — | 2000-03-14 |
| 4935989 | Pneumatic door closer with sustained closing force during closure | — | 1990-06-26 |
| 4709445 | Method and apparatus for closing a door | Russell W. Waldo | 1987-12-01 |
| D292172 | Deadbolt lock for hinged doors | Harvey F. Berg | 1987-10-06 |
| 4632439 | Door latching apparatus | — | 1986-12-30 |
| 4588221 | Segmented door opener | Gene A. Tracy, George L. Engstrom, John Thorson | 1986-05-13 |
| 4570985 | Locking apparatus for use with a panel slideable in a plane | Russell W. Waldo, Louis D. Huot, George L. Engstrom | 1986-02-18 |
| 4317475 | Liquid filling and level sensing apparatus | Robert F. Folley, Ralph H. Larson | 1982-03-02 |