Velocity selector using light conducting rods and a plurality of light beam interrupters

• US 3,398,288 A
• Filed: 02/16/1965
• Issued: 08/20/1968
• Est. Priority Date: 02/16/1965
• Status: Expired due to Term

• Current Assignee: Elvin W. Melton, Warren M. Sanders
• Original Assignee: Elvin W. Melton, Warren M. Sanders
• Inventors: Sanders, Warren M., Melton, Elvin W.
• Application Number:
  US04/433,237
• Time in Patent Office: 1,281 Days
• US Class Current: 250/222.1
• CPC Class Codes: B61L 25/021 Measuring and recording of train speed
• CPC Class Codes: G01P 15/16 by evaluating the time-derivative of a measured speed signal
• CPC Class Codes: G01P 3/68 using optical means, i.e. using infrared, visible, or ultraviolet light G01P3/80 takes precedence ; by reflection of waves G01S17/58

Claims