Granted Patent
Utility
US 4,495,987 · App. 06/467,726
Tube and tube sheet assembly
Inventor:
Marshall N. Finnan
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Feb 18, 1983
Inventor
Marshall N. Finnan
Assignee (at issue)
Occidental Research Corporation
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.