Granted Patent
Utility
US 4,555,331 · App. 06/696,863
Self-metering semi-automatic quantitative filtration assembly
Inventors:
Michael Thornton, Benton C. Clark, III
Patented Case
View Patent ↗
Granted: Nov 26, 1985
Filed: Jan 30, 1985
Inventors
Michael Thornton
Benton C. Clark, III
Assignee (at issue)
LOCKHEED MARTIN 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.