Granted Patent
Utility
US 4,592,667 · App. 06/796,932
Method and apparatus for minimizing effect of hard spots in rotating frame structure of mining machine on roller bearings
Inventor:
Dev R. Malik
Patented Case
View Patent ↗
Granted: Jun 3, 1986
Filed: Nov 12, 1985
Inventor
Dev R. Malik
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.