Granted Patent
Utility
US 4,922,307 · App. 07/213,852
Method and apparatus for improving the measuring accuracy of a micrometer
Inventor:
Michael J. Schaffer
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Jun 30, 1988
Inventor
Michael J. Schaffer
Assignee (at issue)
Hughes Aircraft Company
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.