Granted Patent
Utility
US 4,674,784 · App. 06/832,331
Suction-type gripping mechanism with magnetic actuated vent valve
Inventor:
William J. Wooley
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Feb 24, 1986
Inventor
William J. Wooley
Assignee (at issue)
Avondale Industries, 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.