Granted Patent
Utility
US 4,630,690 · App. 06/755,053
Spiralling tapered slip-on drill string stabilizer
Inventors:
Thomas R. Beasley, Chuan C. Teng
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Jul 12, 1985
Inventors
Thomas R. Beasley
Chuan C. Teng
Assignee (at issue)
Dailey Petroleum Services Corp.
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.