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Patent applications and USPTO patent grants for Krier; Keith N..The latest application filed is for "multi-speed drive with forward/reverse lockout".
Patent | Date |
---|---|
Multi-speed drive with forward/reverse lockout Grant 4,378,855 - Haub , et al. * April 5, 1 | 1983-04-05 |
Multi-speed brush control Grant 4,262,382 - Brown , et al. April 21, 1 | 1981-04-21 |
Surface maintenance machine drive and brush Grant 4,138,756 - Krier , et al. February 13, 1 | 1979-02-13 |
Surface cleaning apparatus Grant 3,881,215 - Krier , et al. May 6, 1 | 1975-05-06 |
Apparatus For Cleaning Surfaces Grant 3,837,038 - Kimzey , et al. September 24, 1 | 1974-09-24 |
Scrubbing Machine Grant 3,824,645 - Krier , et al. July 23, 1 | 1974-07-23 |
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