Granted Patent
Utility
US 4,829,745 · App. 07/129,504
Tube spreader for removing wrinkles in tube stock
Inventors:
R. Douglas Behr, Larry M. Zieke
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Dec 7, 1987
Inventors
R. Douglas Behr
Larry M. Zieke
Assignee (at issue)
THE DOW CHEMICAL 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.