Granted Patent
Utility
US 4,536,140 · App. 06/551,447
Pump apparatus and system for containing and metering uniform pulses of a small amount of a hazardous liquid
Inventor:
Roger T. Guthrie
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Nov 14, 1983
Inventor
Roger T. Guthrie
Assignee (at issue)
M&T Chemicals, 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.