US PATENT SUBCLASS 968 / 490
.~ Incorporating a stepping motor (subclasses 302 to 488 take precedence) generating timing pulses subclasses 817 and 901; setting subclass 906; synchronization subclass 920; generating commutating pulses in masterclocks subclasses 525 and 541; slave clocks actuated intermittently by electromechanical step-advancing mechanisms subclass 548; control circuits for stepping motors in general H02P 8/00) [G04C 3/14]


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



968 /   HD   HOROLOGY

446  DD  ELECTROMECHANICAL CLOCKS OR WATCHES INDEPENDENT OF OTHER TIMEPIECES AND IN WHICH THE MOVEMENT IS MAINTAINED BY ELECTRIC MEANS (synchronization subclass 506) [G04C 3/00] {8}
490.~ Incorporating a stepping motor (subclasses 302 to 488 take precedence) generating timing pulses subclasses 817 and 901; setting subclass 906; synchronization subclass 920; generating commutating pulses in masterclocks subclasses 525 and 541; slave clocks actuated intermittently by electromechanical step-advancing mechanisms subclass 548; control circuits for stepping motors in general H02P 8/00) [G04C 3/14] {2}
491  DD  .~.~> Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g., detection of unwanted or missing step, etc. [G04C 3/14B]
492  DD  .~.~> Incorporating two or more stepping motors or rotors [G04C 3/14C]