Granted Patent
Utility
US 6,158,182 · App. 09/063,504
Building curtain wall
Inventor:
Lawrence F. Biebuyck
Patented Case
View Patent ↗
Granted: Dec 12, 2000
Filed: Apr 21, 1998
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.