Granted Patent
Utility
US 4,728,153 · App. 06/944,785
Cylindrical retainer for a cutting bit
Inventors:
Randall W. Ojanen, John Anderson
Patented Case
View Patent ↗
Granted: Mar 1, 1988
Filed: Dec 22, 1986
Inventors
Randall W. Ojanen
John Anderson
Assignee (at issue)
GTE Products 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.