Granted Patent
Utility
US 4,194,776 · App. 05/861,353
Security astragal for double door assembly
Inventor:
Lawrence F. Biebuyck
Patented Case
View Patent ↗
Granted: Mar 25, 1980
Filed: Dec 16, 1977
Inventor
Lawrence F. Biebuyck
Assignee (at issue)
HOWMET CORPORATION
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.