Granted Patent
Utility
US 4,722,608 · App. 06/760,370
Mixing apparatus
Inventors:
Ronald N. Salzman, Keith T. McDermott
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Jul 30, 1985
Inventors
Ronald N. Salzman
Keith T. McDermott
Assignee (at issue)
Federal Signal 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.