Granted Patent
Utility
US 4,142,209 · App. 05/777,474
Disc track servo system
Inventors:
Lee V. Hedlund, Ronald P. Fink, David I. Wright
Patented Case
View Patent ↗
Granted: Feb 27, 1979
Filed: Mar 14, 1977
Inventors
Lee V. Hedlund
Ronald P. Fink
David I. Wright
Assignee (at issue)
RCA 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.