Granted Patent
Utility
US 4,344,558 · App. 06/166,171
Pinch bottom valve bag
Inventors:
Donald O. Newton, Fred B. Wilharm
Patented Case
View Patent ↗
Granted: Aug 17, 1982
Filed: Jul 7, 1980
Inventors
Donald O. Newton
Fred B. Wilharm
Assignee (at issue)
St. Regis Paper Company
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.