Granted Patent
Utility
US 4,389,780 · App. 06/154,785
Bag opening device for can openers
Inventors:
Richard J. Ostroski, James B. Aberer, Gary R. Best
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: May 30, 1980
Inventors
Richard J. Ostroski
James B. Aberer
Gary R. Best
Assignee (at issue)
Rival Manufacturing 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.