The following is a U.K. Patent Application filed on July 1, 1955 by The English Electric Company Limited, Harold Aspden being co-inventor with E. K. Sandeman. It was published on July 2, 1958.
Commentary: This is a patent concerning electronic circuitry needed
for use in conjunction with ballistic missile guidance control.
The patent discloses design details of a circuit including series and parallel inductive-capacitive tuned units which assure an extremely low phase-shift particularly suited to radar systems in which doppler frequency is to be multiplied.