Granted Patent
Utility
US 4,433,814 · App. 06/485,111
Core-engager retainer for an expansible shaft
Inventors:
Virgil M. Pontes, Lawrence C. Young
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Apr 14, 1983
Inventors
Virgil M. Pontes
Lawrence C. Young
Assignee (at issue)
DOUBLE E COMPANY
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.