Granted Patent
Utility
US 4,690,556 · App. 06/760,381
Capillary bore straightness inspection
Inventor:
Ray A. Walker
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: Jul 30, 1985
Inventor
Ray A. Walker
Assignee (at issue)
Spectra-Physics, 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.