Granted Patent
Utility
US 4,355,984 · App. 06/133,850
Teaching device
Inventors:
William H. Slavik, William P. Carlson, Michael J. McGowan
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Mar 25, 1980
Inventors
William H. Slavik
William P. Carlson
Michael J. McGowan
Assignee (at issue)
Nuvatec, 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.