Granted Patent
Utility
US 4,434,637 · App. 06/354,212
Method and apparatus for flattening corrugated heat exchanger plate
Inventor:
John M. Bailey
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Mar 3, 1982
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.