Granted Patent
Utility
US 5,553,926 · App. 08/343,694
Self-propelled mining apparatus and method for cutting arched opening
Inventors:
Jon C. Blackstock, John A. Baird, Jr., Ian T. Carr
Patented Case
View Patent ↗
Granted: Sep 10, 1996
Filed: Nov 22, 1994
Inventors
Jon C. Blackstock
John A. Baird, Jr.
Ian T. Carr
Assignee (at issue)
Mining Technologies, 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.