Granted Patent
Utility
US 4,549,232 · App. 06/507,647
Phase modulated servo system
Inventors:
Frederick E. Axmear, David W. Collins
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: Jun 27, 1983
Inventors
Frederick E. Axmear
David W. Collins
Assignee (at issue)
International Business Machines 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.