Granted Patent
Utility
US 4,126,280 · App. 05/815,099
Impact crusher
Inventor:
John H. Burk
Patented Case
View Patent ↗
Granted: Nov 21, 1978
Filed: Jul 13, 1977
Inventor
John H. Burk
Assignee (at issue)
Black Clawson Company, 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.