US PATENT SUBCLASS 968 / 902
.~ Circuits for deriving low frequency timing pulses from pulses of higher frequency (pulse frequency dividers in general H03K 23/00 to 29/00) [G04F 3/02]


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968 /   HD   HOROLOGY

901  DD  PRODUCING TIMING PULSES (driving circuits for stepping motors subclass 490; producing preselected time intervals for use as timing standards subclass 817; pulse technique in general H03K; control, synchronization, or stabilization of generators in general H03L) [G04G 3/00] {1}
902.~ Circuits for deriving low frequency timing pulses from pulses of higher frequency (pulse frequency dividers in general H03K 23/00 to 29/00) [G04F 3/02] {3}
903  DD  .~.~> The desired number of pulses per unit of time being obtained by adding to or substracting from a pulse train one or more pulses (in general G06F 7/68) [G04G 3/02B]
904  DD  .~.~> By storing time and date which are periodically investigated and modified accordingly, e.g., by using cyclic shift registers, etc. [G04G 3/02D]
905  DD  .~.~> By combining pulse trains of different frequencies, e.g., obtained from two independent oscillators or from a common oscillator by means of different frequency dividing ratios, etc. (synchronization of electric timepieces subclasses 506 and 920) [G04G 3/02E]