Granted Patent
Utility
US 4,956,824 · App. 07/405,944
Position determination apparatus
Inventors:
Seymour J. Sindeband, Robert D. Butler
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Sep 12, 1989
Inventors
Seymour J. Sindeband
Robert D. Butler
Assignee (at issue)
Science Accessories Corp.
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.