Granted Patent
Utility
US 4,308,999 · App. 06/071,053
Method and apparatus for longitudinally reinforcing continuously generated plastic pipe
Inventor:
J. Warne Carter, Sr.
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Aug 30, 1979
Inventor
J. Warne Carter, Sr.
Assignee (at issue)
Ciba-Geigy
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.