Granted Patent
Utility
US 4,824,907 · App. 07/166,127
Preparation of thermoformed plastics articles
Inventor:
Harmen Z. K. Coster
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Mar 9, 1988
Inventor
Harmen Z. K. Coster
Assignee (at issue)
Borg-Warner Chemicals, 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.