Granted Patent
Utility
US 4,879,697 · App. 07/228,680
Sonar fish finder apparatus providing split-screen display
Inventors:
Darrell J. Lowrance, Ronald G. Weber
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Aug 5, 1988
Inventors
Darrell J. Lowrance
Ronald G. Weber
Assignee (at issue)
Lowrance Electronics, Inc.
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.