Granted Patent
Utility
US 4,901,474 · App. 07/167,221
Pneumatic door operator having novel pneumatic actuator and lock
Inventors:
Robert G. Bayard, Anthony J. Walsh
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Mar 11, 1988
Inventors
Robert G. Bayard
Anthony J. Walsh
Assignee (at issue)
VAPOR CORP.
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.