Granted Patent
Utility
US 4,999,952 · App. 07/363,691
Method and apparatus for manufacturing K-files and reamers
Inventors:
Robert D. Speiser, Steven A. Bernstein, Charles N. Miller, Dane Shearer
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Jun 9, 1989
Inventors
Robert D. Speiser
Steven A. Bernstein
Charles N. Miller
Dane Shearer
Assignee (at issue)
Union Broach
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.