Granted Patent
Utility
US 4,334,803 · App. 06/096,837
Mine roof bolt
Inventors:
Patrick C. Westlake, Keith A. Fish, James D. Mallory
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Nov 23, 1979
Inventors
Patrick C. Westlake
Keith A. Fish
James D. Mallory
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.