Granted Patent
Utility
US 4,253,708 · App. 06/085,642
Slack control for crawler type track assemblies
Inventor:
Glenn M. Haslett
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Apr 20, 1979
Inventor
Glenn M. Haslett
Assignee (at issue)
Caterpillar Tractor Co.
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.