Granted Patent
Utility
US 4,920,544 · App. 07/308,555
Delta-sigma modulator
Inventors:
Seiji Endo, Osamu Kobayashi, Masatsugu Kamimura
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Feb 10, 1989
Inventors
Seiji Endo
Osamu Kobayashi
Masatsugu Kamimura
Assignee (at issue)
Fujitsu Limited
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.