Granted Patent
Utility
US 4,323,401 · App. 05/796,586
Bearing having an array of microasperities
Inventors:
William H. Belke, Joseph C. Hafele, Ernest W. Landen, Thomas J. Richards
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: May 13, 1977
Inventors
William H. Belke
Joseph C. Hafele
Ernest W. Landen
Thomas J. Richards
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.