Granted Patent
Utility
US 4,304,375 · App. 06/039,943
Electrically controlled elevator
Inventors:
Kenneth E. Builta, Samuel W. Ferguson, III
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: May 17, 1979
Inventors
Kenneth E. Builta
Samuel W. Ferguson, III
Assignee (at issue)
Textron 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.