Granted Patent
Utility
US 4,638,149 · App. 06/507,659
Power-processing unit
Inventors:
Frank J. Wessel, Donald J. Hancock
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Jun 27, 1983
Inventors
Frank J. Wessel
Donald J. Hancock
Assignee (at issue)
Hughes Aircraft Company
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.