Granted Patent
Utility
US 5,253,277 · App. 07/788,706
Vent assembly
Inventor:
Bruce F. Allen
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Nov 6, 1991
Inventor
Bruce F. Allen
Assignee (at issue)
Combustion Engineering, 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.