Granted Patent
Utility
US 4,336,820 · App. 05/938,555
Metering device for adding one fluid to another
Inventors:
Richard Jorgensen, Gerald G. Steele
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Aug 31, 1978
Inventors
Richard Jorgensen
Gerald G. Steele
Assignee (at issue)
Parker-Hannifin 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.