Granted Patent
Utility
US 5,844,675 · App. 08/866,747
Interchangeable sample stage with integral reference surface for magnetic-head suspension measuring instrument
Inventors:
John B. Hayes, Eric M. Frey
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: May 30, 1997
Inventors
John B. Hayes
Eric M. Frey
Assignee (at issue)
Wyko, 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.