Granted Patent
Utility
US 4,257,748 · App. 06/000,573
Flow indicator for positive displacement pump
Inventors:
Frank E. Ives, Terrence G. Nash
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Jan 2, 1979
Inventors
Frank E. Ives
Terrence G. Nash
Assignee (at issue)
Venus Products, 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.