Granted Patent
Utility
US 4,188,811 · App. 05/928,315
Metal forming methods
Inventor:
Daniel J. Brimm
Patented Case
View Patent ↗
Granted: Feb 19, 1980
Filed: Jul 26, 1978
Inventor
Daniel J. Brimm
Assignee (at issue)
Chemtronics Co., Ltd.
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.