Granted Patent
Utility
US 4,481,906 · App. 06/516,757
Valve for use in a suction line
Inventors:
Gary C. Steingraber, Terrence J. Mullen
Patented Case
View Patent ↗
Granted: Nov 13, 1984
Filed: Jul 25, 1983
Inventors
Gary C. Steingraber
Terrence J. Mullen
Assignee (at issue)
DEC International, 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.