Granted Patent
Utility
US 5,230,235 · App. 07/868,330
Flat die thread roller
Inventors:
Gregory A. Smith, Dale E. Foltz, Robert E. Wisebaker, Robert E. Loy
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Apr 14, 1992
Inventors
Gregory A. Smith
Dale E. Foltz
Robert E. Wisebaker
Robert E. Loy
Assignee (at issue)
NATIONAL MACHINE 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.