Granted Patent
Utility
US 5,632,063 · App. 08/262,135
Counterbalancing mechanism for an overhead door
Inventors:
Kenneth E. Carper, Alan R. Leist, Tony Y. Lin, George S. Carper, Thomas E. Agin
Patented Case
View Patent ↗
Granted: May 27, 1997
Filed: Jun 16, 1994
Inventors
Kenneth E. Carper
Alan R. Leist
Tony Y. Lin
George S. Carper
Thomas E. Agin
Assignee (at issue)
Clopay Building Products Company, 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.