Granted Patent
Utility
US 4,539,632 · App. 06/425,733
Programmable maintenance timer system
Inventors:
John C. Hansen, Lloyd A. Johnson
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Sep 28, 1982
Inventors
John C. Hansen
Lloyd A. Johnson
Assignee (at issue)
BorgWarner Inc.
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.