Granted Patent
Utility
US 4,816,089 · App. 07/069,721
Process for heat treating a heat exchanger tube surrounded by a support plate
Inventors:
Wenche W. Cheng, George G. Elder
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Jun 6, 1987
Inventors
Wenche W. Cheng
George G. Elder
Assignee (at issue)
Westinghouse Electric Company LLC
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.