Granted Patent
Utility
US 3,950,205 · App. 05/388,047
Rotary heat sealer
Inventors:
Albert W. Hawkins, Ronald J. O'Shea, Herbert M. Case
Patented Case
View Patent ↗
Granted: Apr 13, 1976
Filed: Aug 13, 1973
Inventors
Albert W. Hawkins
Ronald J. O'Shea
Herbert M. Case
Assignee (at issue)
Union Carbide 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.