Granted Patent
Utility
US 4,161,967 · App. 05/875,023
Thermal sleeve
Inventor:
Theodore Sprague
Patented Case
View Patent ↗
Granted: Jul 24, 1979
Filed: Feb 3, 1978
Inventor
Theodore Sprague
Assignee (at issue)
The Babcock & Wilcox Company
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.