Granted Patent
Utility
US 4,307,451 · App. 06/128,287
Backup control
Inventors:
Raymond D. Zagranski, Albert H. White
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Mar 7, 1980
Inventors
Raymond D. Zagranski
Albert H. White
Assignee (at issue)
Chandler Evans 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.