Granted Patent
Utility
US 4,917,350 · App. 07/381,607
Gasketless air damper
Inventors:
Barry C. Beyer, Thomas M. Pendergrass
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Jul 18, 1989
Inventors
Barry C. Beyer
Thomas M. Pendergrass
Assignee (at issue)
American Standard 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.