Granted Patent
Utility
US 4,446,958 · App. 06/321,862
Cross-pit conveyor
Inventor:
Thomas H. Dalrymple
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Nov 16, 1981
Inventor
Thomas H. Dalrymple
Assignee (at issue)
Dresser Industries, 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.