Granted Patent
Utility
US 4,544,808 · App. 06/542,038
Telephone indicator
Inventors:
Robin I. Milne, Lester Kirkland
Patented Case
View Patent ↗
Granted: Oct 1, 1985
Filed: Oct 14, 1983
Inventors
Robin I. Milne
Lester Kirkland
Assignee (at issue)
Mitel 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.