Granted Patent
Utility
US 4,359,281 · App. 06/142,830
Method and apparatus for testing the braking efficiency of machines
Inventor:
John Humphries
Patented Case
View Patent ↗
Granted: Nov 16, 1982
Filed: Apr 22, 1980
Inventor
John Humphries
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.