Granted Patent
Utility
US 4,634,527 · App. 06/844,239
Fluid filter element with annular sealing means
Inventor:
Dennis Marshall
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Mar 25, 1986
Inventor
Dennis Marshall
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.