Granted Patent
Utility
US 6,196,270 · App. 09/315,865
Thread protector
Inventors:
Darrell Richards, Colin Rush, William Thornton, Henry Campbell King, Vincent Danko Grbic, Edgar Von Rosenberg
Patented Case
View Patent ↗
Granted: Mar 6, 2001
Filed: May 20, 1999
Inventors
Darrell Richards
Colin Rush
William Thornton
Henry Campbell King
Vincent Danko Grbic
Edgar Von Rosenberg
Assignee (at issue)
DRILLTEC PATENTS & TECHNOLOGIES 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.