Granted Patent
Utility
US 5,319,882 · App. 07/665,810
Entrance system
Inventor:
Lawrence F. Biebuyck
Patented Case
View Patent ↗
Granted: Jun 14, 1994
Filed: Mar 7, 1991
Inventor
Lawrence F. Biebuyck
Assignee (at issue)
BUTLER MANUFACTURING 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.