Granted Patent
Utility
US 4,958,244 · App. 07/294,053
Method of position detection on a recording medium
Inventors:
Yoshizumi Inazawa, Brian A. Milthorp, Bruce A. Thompson
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Jan 5, 1989
Inventors
Yoshizumi Inazawa
Brian A. Milthorp
Bruce A. Thompson
Assignee (at issue)
SONY GROUP 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.