Granted Patent
Utility
US 4,901,923 · App. 07/255,814
Variable dilution ratio hose-end aspirator sprayer
Inventors:
Peter K. McRoskey, Paul M. Havlovitz
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Oct 11, 1988
Inventors
Peter K. McRoskey
Paul M. Havlovitz
Assignee (at issue)
Chevron Research Company
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.