Granted Patent
Utility
US 4,556,921 · App. 06/509,841
Method and apparatus to improve the positioning accuracy of a tracking arm
Inventor:
Andrew M. Rose
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Jun 30, 1983
Inventor
Andrew M. Rose
Assignee (at issue)
Memorex Corporation
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.