Granted Patent
Utility
US 4,193,633 · App. 05/861,451
Core chuck
Inventor:
Blaine Potter
Patented Case
View Patent ↗
Granted: Mar 18, 1980
Filed: Dec 16, 1977
Inventor
Blaine Potter
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.