Granted Patent
Utility
US 5,143,687 · App. 07/652,125
Rapid change wedge chuck with positive lock
Inventors:
Carl J. Howard, Donald J. Wrobel
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: Feb 7, 1991
Inventors
Carl J. Howard
Donald J. Wrobel
Assignee (at issue)
Sheffer Collet 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.