Granted Patent
Utility
US 6,227,777 · App. 09/436,817
High speed drilling spindle with reciprocating shaft and double-gripping centrifugal chuck
Inventor:
Wojciech B. Kosmowski
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Nov 9, 1999
Inventor
Wojciech B. Kosmowski
Assignee (at issue)
Electro Scientific Industries, Inc.
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.