Granted Patent
Utility
US 4,089,115 · App. 05/742,551
Spring grip chuck assembly for dental handpieces
Inventors:
Donald J. Heil, Boubene M. Jaremus
Patented Case
View Patent ↗
Granted: May 16, 1978
Filed: Nov 17, 1976
Inventors
Donald J. Heil
Boubene M. Jaremus
Assignee (at issue)
American Hospital Supply Corp.
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.