Granted Patent
Utility
US 4,631,974 · App. 06/796,143
Polymeric split sprocket wheel
Inventors:
James Wiegand, Thomas J. Casper
Patented Case
View Patent ↗
Granted: Dec 30, 1986
Filed: Nov 8, 1985
Inventors
James Wiegand
Thomas J. Casper
Assignee (at issue)
Envirex, 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.