Granted Patent
Utility
US 4,640,305 · App. 06/671,477
High temperature, zero leakage packing assembly
Inventor:
Roger Johnson
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Nov 14, 1984
Inventor
Roger Johnson
Assignee (at issue)
White Consolidated Industries, Inc.
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.