Granted Patent
Utility
US 4,257,617 · App. 05/958,295
Shaft seal assembly
Inventor:
M. Raymond Hill
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Nov 6, 1978
Inventor
M. Raymond Hill
Assignee (at issue)
CARRIER 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.