Granted Patent
Utility
US 4,299,405 · App. 06/148,317
Tractor ballast weight assemblies
Inventors:
John Withers, Alec Sykes, Stephen M. Brogan
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: May 9, 1980
Inventors
John Withers
Alec Sykes
Stephen M. Brogan
Assignee (at issue)
David Brown Tractors Ltd.
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.