Granted Patent
Utility
US 4,658,238 · App. 06/411,035
Method and apparatus for providing selectively variable modulation signal for a carrier wave
Inventor:
Sioe T. Mak
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Aug 24, 1982
Inventor
Sioe T. Mak
Assignee (at issue)
Emerson Electric Co.
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.