Granted Patent
Utility
US 4,920,311 · App. 07/263,486
User selection of meter ballistics
Inventors:
Robert Bateman, Donald R. Christensen
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Oct 27, 1988
Inventors
Robert Bateman
Donald R. Christensen
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.