Granted Patent
Utility
US 4,528,733 · App. 06/516,673
Method of making tubular heat exchangers
Inventor:
Thomas J. Lord
Patented Case
View Patent ↗
Granted: Jul 16, 1985
Filed: Jul 25, 1983
Inventor
Thomas J. Lord
Assignee (at issue)
United Aircraft Products, Inc.
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.