Granted Patent
Utility
US 4,246,812 · App. 06/018,131
Method and apparatus for boring a tapered, curved I.D. tubular casting mold
Inventors:
Floyd R. Gladwin, Joseph Grzincic
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Mar 7, 1979
Inventors
Floyd R. Gladwin
Joseph Grzincic
Assignee (at issue)
Gladwin 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.