Granted Patent
Utility
US 4,828,339 · App. 06/913,828
Crawler chain
Inventors:
Terry M. Thomas, Joseph S. David
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Sep 30, 1986
Inventors
Terry M. Thomas
Joseph S. David
Assignee (at issue)
Joy Technologies Inc.
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.