Granted Patent
Utility
US 4,582,555 · App. 06/682,405
Heatseal die
Inventor:
William Ben Bower
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Dec 17, 1984
Inventor
William Ben Bower
Assignee (at issue)
Crown Zellerbach 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.