Granted Patent
Utility
US 5,213,155 · App. 07/872,316
Method and apparatus for multiple locking a single row of heat exchanger tubes
Inventor:
Robert B. Hahn
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Apr 23, 1992
Inventor
Robert B. Hahn
Assignee (at issue)
Atlantic 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.