Granted Patent
Utility
US 4,420,449 · App. 06/369,584
Process for producing articles from polytetrafluoroethylene
Inventors:
Zenas Crocker, A. Nelson Wright
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Apr 19, 1982
Inventors
Zenas Crocker
A. Nelson Wright
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.