Granted Patent
Utility
US 4,565,215 · App. 06/612,999
Chemical injection valve
Inventors:
Leslie L. Cummings, deceased, by Mildred Cummings, executrix
Patented Case
View Patent ↗
Granted: Jan 21, 1986
Filed: May 21, 1984
Inventors
Leslie L. Cummings, deceased
by Mildred Cummings, executrix
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.