Granted Patent
Utility
US 4,233,331 · App. 05/929,489
Method of securing opener key to a container using oriented polypropylene film with solventless acrylic adhesive
Inventors:
Harold C. Lemke, Stanley E. Rohowetz
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: Jul 31, 1978
Inventors
Harold C. Lemke
Stanley E. Rohowetz
Assignee (at issue)
American Can 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.