Zunkel; Richard L.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Zunkel; Richard L..The latest application filed is for "torque modification apparatus for use with a door closer".
- Zunkel; Richard L. - Foster City CA
- Zunkel; Richard L. - Princeton IL
- Zunkel; Richard L. - Marshville NC
| Patent | Date |
|---|---|
| Torque modification apparatus for use with a door closer Grant 4,788,742 - Edgett , et al. December 6, 1 | 1988-12-06 |
| Door control device with alarm switch Grant 4,721,946 - Zunkel January 26, 1 | 1988-01-26 |
| Doorholder assembly for a pocket door Grant 4,696,500 - Zunkel September 29, 1 | 1987-09-29 |
| Door control switching device Grant 4,429,490 - Zunkel February 7, 1 | 1984-02-07 |
| Door closer and holder Grant 4,414,703 - Schnarr , et al. November 15, 1 | 1983-11-15 |
| Door closer Grant 4,386,446 - Zunkel , et al. June 7, 1 | 1983-06-07 |
| Zero force hold open door closer Grant 4,115,897 - Zunkel September 26, 1 | 1978-09-26 |
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