Granted Patent
Utility
US 4,090,843 · App. 05/777,195
Apparatus for maintaining a vapor blanket in a condensation heating facility
Inventors:
Tze Yao Chu, George Michael Wenger
Patented Case
View Patent ↗
Granted: May 23, 1978
Filed: Mar 14, 1977
Inventors
Tze Yao Chu
George Michael Wenger
Assignee (at issue)
Western Electric Company, 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.