Granted Patent
Utility
US 4,377,977 · App. 06/191,418
Concrete security structures and method for making same
Inventor:
Harry J. Wurster
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Sep 29, 1980
Inventor
Harry J. Wurster
Assignee (at issue)
The Mosler Safe 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.