Granted Patent
Utility
US 3,977,264 · App. 05/598,340
Method of making poly-V pulleys and product
Inventor:
Nolte V. Sproul
Patented Case
View Patent ↗
Granted: Aug 31, 1976
Filed: Jul 23, 1975
Inventor
Nolte V. Sproul
Assignee (at issue)
Aspro, 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.