Granted Patent
Utility
US 4,637,559 · App. 06/308,092
Sand lump crushing device
Inventors:
Joseph E. Bowling, James H. Carpenter, Russell L. Rowe
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Oct 2, 1981
Inventors
Joseph E. Bowling
James H. Carpenter
Russell L. Rowe
Assignee (at issue)
Kennecott Holdings Company
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.