Granted Patent
Utility
US 5,056,348 · App. 07/482,865
Method of making a profiled sheet metal building unit
Inventors:
Raymond E. Albrecht, Charles R. Gray
Patented Case
View Patent ↗
Granted: Oct 15, 1991
Filed: Feb 22, 1990
Inventors
Raymond E. Albrecht
Charles R. Gray
Assignee (at issue)
Robertson-Ceco 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.