Granted Patent
Utility
US 4,947,133 · App. 07/145,099
Method and apparatus for automatic signal level adustment
Inventor:
Louis David Thomas
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Jan 19, 1988
Inventor
Louis David Thomas
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.