Granted Patent
Utility
US 5,625,545 · App. 08/203,803
Medium voltage PWM drive and method
Inventor:
Peter Willard Hammond
Patented Case
View Patent ↗
Granted: Apr 29, 1997
Filed: Mar 1, 1994
Inventor
Peter Willard Hammond
Assignee (at issue)
Halmar Robicon Group
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.