Granted Patent
Utility
US 4,244,628 · App. 06/130,227
Guide roller assembly
Inventors:
Douglas W. J. Nayler, Michael R. Scalf, Sr.
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Mar 14, 1980
Inventors
Douglas W. J. Nayler
Michael R. Scalf, Sr.
Assignee (at issue)
NL Industries, Inc.
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.