Granted Patent
Utility
US 4,259,453 · App. 06/156,291
Activation of blowing agents
Inventor:
Rhomie L. Heck, III
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Jun 4, 1980
Inventor
Rhomie L. Heck, III
Assignee (at issue)
Uniroyal Ltd.
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.