Granted Patent
Utility
US 4,448,738 · App. 06/358,046
Process for producing foamed plastic articles
Inventor:
Zenas Crocker
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Mar 15, 1982
Inventor
Zenas Crocker
Assignee (at issue)
Synergistics Chemicals 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.