Zelm; Richard J.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Zelm; Richard J..The latest application filed is for "automatic insulation resistance testers with heater".
- Zelm; Richard J. - Lac Du Flambeau WI
- Zelm; Richard J. - Marrero LA
| Patent | Date |
|---|---|
| Automatic insulation resistance testers with heater Grant 10,782,357 - Zelm Sept | 2020-09-22 |
| Automatic insulation resistance testers Grant 9,977,067 - Zelm May 22, 2 | 2018-05-22 |
| Automatic insulation resistance testers Grant 9,664,716 - Zelm May 30, 2 | 2017-05-30 |
| Minimum off-time device for protecting refrigeration compressors after a power interruption Grant 5,524,448 - Schwanebeck , et al. June 11, 1 | 1996-06-11 |
| Automatic insulation test equipment for testing high voltage electrical equipment at the rated voltage level Grant 5,514,967 - Zelm May 7, 1 | 1996-05-07 |
| Automatic insulation tester for grounded and ungrounded electrical equipment Grant 5,172,289 - Zelm December 15, 1 | 1992-12-15 |
| Automatic insulation tester for grounded and ungrounded electrical equipment Grant 5,155,441 - Zelm October 13, 1 | 1992-10-13 |
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