Granted Patent
Utility
US 4,147,447 · App. 05/905,461
Snowplowable pavement marker and base member therefor
Inventors:
Sidney A. Heenan, Robert M. Flanagan
Patented Case
View Patent ↗
Granted: Apr 3, 1979
Filed: May 12, 1978
Inventors
Sidney A. Heenan
Robert M. Flanagan
Assignee (at issue)
ARTERICA 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.