Granted Patent
Utility
US 4,521,910 · App. 06/602,134
Multiwall cooler bag
Inventors:
Stephen C. Keppel, Donald O. Newton, Stephen R. Salt
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Apr 19, 1984
Inventors
Stephen C. Keppel
Donald O. Newton
Stephen R. Salt
Assignee (at issue)
St. Regis 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.