Granted Patent
Utility
US 4,934,878 · App. 07/289,946
Center and peripheral cutting end mill
Inventors:
Lawrence Plutschuck, Thomas J. Conrad
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Dec 27, 1988
Inventors
Lawrence Plutschuck
Thomas J. Conrad
Assignee (at issue)
GTE Valenite Corporation
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.