Granted Patent
Utility
US 4,460,202 · App. 06/210,479
Intermediate weight drill string member
Inventors:
Glenn G. Chance, William Kovensky
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Nov 26, 1980
Inventors
Glenn G. Chance
William Kovensky
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.