Granted Patent
Utility
US 4,246,059 · App. 06/027,114
Method and apparatus for forming tubular plastic sleeves for flat folding
Inventor:
Clyde F. Hadl
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Apr 4, 1979
Inventor
Clyde F. Hadl
Assignee (at issue)
Owens-Illinois Inc.
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.