Granted Patent
Utility
US 6,251,257 · App. 09/441,153
Apparatus and method for electrochemically etching grooves in an outer surface of a shaft
Inventor:
Dustin Cochran
Patented Case
View Patent ↗
Granted: Jun 26, 2001
Filed: Nov 12, 1999
Inventor
Dustin Cochran
Assignee (at issue)
Seagate Technology LLC
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.