Granted Patent
Utility
US 4,121,843 · App. 05/839,187
Multiple convolution sealing ring
Inventor:
Horace P. Halling
Patented Case
View Patent ↗
Granted: Oct 24, 1978
Filed: Oct 4, 1977
Inventor
Horace P. Halling
Assignee (at issue)
Pressure Science Incorporated
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.