Granted Patent
Utility
US 4,560,928 · App. 06/642,714
Velocity or distance measuring apparatus using magnetic dipoles
Inventor:
Ian P. Hayward
Patented Case
View Patent ↗
Granted: Dec 24, 1985
Filed: Aug 22, 1984
Inventor
Ian P. Hayward
Assignee (at issue)
British Gas
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.