Granted Patent
Utility
US 4,260,350 · App. 06/140,648
Filter for high viscosity liquids
Inventor:
Luther O. Russell, Jr.
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: Apr 16, 1980
Inventor
Luther O. Russell, Jr.
Assignee (at issue)
Fiber 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.