Granted Patent
Utility
US 5,930,758 · App. 08/887,417
Audio signal reproducing apparatus with semiconductor memory storing coded digital audio data and including a headphone unit
Inventors:
Masayuki Nishiguchi, Yoshihito Fujiwara
Patented Case
View Patent ↗
Granted: Jul 27, 1999
Filed: Jul 2, 1997
Inventors
Masayuki Nishiguchi
Yoshihito Fujiwara
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.