Granted Patent
Utility
US 5,001,333 · App. 07/427,288
Method and apparatus for focus error compensation having path length independence
Inventor:
Daniel Richard Marshall
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Oct 24, 1989
Inventor
Daniel Richard Marshall
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.