Granted Patent
Utility
US 4,395,972 · App. 06/352,455
Multi-valve clawpiece
Inventor:
Tony K. Griffin
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Feb 25, 1982
Inventor
Tony K. Griffin
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.