Granted Patent
Utility
US 4,649,729 · App. 06/691,141
Method for manufacturing steel bar with intermittent smooth surface and patterned relief segments, and mine roof bolt product
Inventors:
A. Dale McDowell, George S. Vass
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Jan 14, 1985
Inventors
A. Dale McDowell
George S. Vass
Assignee (at issue)
Florida Steel Corporation
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.