Granted Patent
Utility
US 4,272,233 · App. 06/051,436
Mold for producing extra thin walled plastic containers
Inventor:
Donald D. Cochran
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Jun 25, 1979
Inventor
Donald D. Cochran
Assignee (at issue)
National Crane 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.