Granted Patent
Utility
US 4,346,582 · App. 06/165,831
Method for flattening corrugated heat exchanger plates
Inventor:
John M. Bailey
Patented Case
View Patent ↗
Granted: Aug 31, 1982
Filed: Jan 28, 1980
Inventor
John M. Bailey
Assignee (at issue)
Caterpillar Tractor Co.
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.