Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6254353 | Method and apparatus for controlling operation of a submersible pump | Massimo Polo, Stefano Cavagna, Robert M. Gamber | 2001-07-03 |
| 5945802 | Ground fault detection and protection method for a variable speed ac electric motor | Robert M. Gamber, Massimo Polo | 1999-08-31 |
| 5883489 | High speed deep well pump for residential use | — | 1999-03-16 |
| 5486748 | Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive | Richard W. Boothe | 1996-01-23 |
| 5403244 | Electric vehicle drive train with direct coupling transmission | Jerome Benedict Tankersley, Richard W. Boothe | 1995-04-04 |
| 5376869 | Electric vehicle drive train with rollback detection and compensation | — | 1994-12-27 |
| 5369540 | Electric vehicle drive train with contactor protection | Ralph A. Benson | 1994-11-29 |
| 5287051 | Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive | Richard W. Boothe | 1994-02-15 |
| 5227703 | Protection system for alternating current, battery powered electric traction motor vehicle | Richard W. Boothe | 1993-07-13 |
| 4870564 | Distributed input/output system | William J. Ketelhut | 1989-09-26 |
| 4764868 | Distributed input/output system | William J. Ketelhut | 1988-08-16 |
| 4593380 | Dual function input/output for a programmable controller | Mark Kocher, Ronald E. Gareis, William J. Ketelhut | 1986-06-03 |
| 4520299 | Turning speed controller for electric vehicles having dual drive motors | — | 1985-05-28 |
| 4500818 | Dual motor proportioning control | Ronald E. Gareis, Amratlal C. Lodhia | 1985-02-19 |
| 4468599 | Plug current regulator | Max Berman, William G. Klimmek | 1984-08-28 |
| 4454503 | Transistor fault indicator | — | 1984-06-12 |
| 4449080 | Electric vehicle protection scheme | Robert C. Clark | 1984-05-15 |
| 4443744 | Method and apparatus for charge enhancement of a commutating capacitor | — | 1984-04-17 |
| 4427930 | Electric vehicle current regulator | Max Berman, William G. Klimmek | 1984-01-24 |
| 4423362 | Electric vehicle current regulating system | Robert C. Clark | 1983-12-27 |
| 4375603 | Shunt-wound control for on-road vehicle | — | 1983-03-01 |
| 4320334 | Battery state-of-charge indicator | Richard K. Davis | 1982-03-16 |
| 4234840 | Battery state-of-charge indicator | Richard K. Davis | 1980-11-18 |