Granted Patent
Utility
US 4,335,755 · App. 06/252,517
Coating for pipe
Inventors:
Thomas H. Sadler, Daniel G. Richlie
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Apr 9, 1981
Inventors
Thomas H. Sadler
Daniel G. Richlie
Assignee (at issue)
Manville Service Corporation
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.