Granted Patent
Utility
US 4,381,149 · App. 05/548,727
Range responsive apparatus
Inventors:
Thomas Hair, Ivor R. Baxter
Patented Case
View Patent ↗
Granted: Apr 26, 1983
Filed: Feb 13, 1975
Inventors
Thomas Hair
Ivor R. Baxter
Assignee (at issue)
The Marconi Company Limited
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.