Granted Patent
Utility
US 4,565,969 · App. 06/489,714
Saturation current incipient soot detector
Inventors:
Douglas B. Olson, Hartwell F. Calcote
Patented Case
View Patent ↗
Granted: Jan 21, 1986
Filed: Apr 29, 1983
Inventors
Douglas B. Olson
Hartwell F. Calcote
Assignee (at issue)
Aerochem Research Laboratories, 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.