Granted Patent
Utility
US 4,252,453 · App. 05/898,419
Acoustic attenuator system for quietizing printers and the like
Inventor:
David A. Estabrooks
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Apr 20, 1978
Inventor
David A. Estabrooks
Assignee (at issue)
Centronics Data Computer 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.