Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
An electric watch comprising a precise resonator, an oscillator coupled to said resonator, a frequency divider connected to the oscillator, a watch movement including drive means therefor and means coupled to the frequency divider and the drive means of the watch movement for controlling the operation thereof to eliminate errors in indicated time, the latter means comprising a first counter coupled for synchronized operation with said drive means of the watch movement, a second reference counter connected to said divider, comparison means connected to said counters for comparing the states thereof and coupled to said drive means of the watch movement for maintaining the counters in phase while varying the speed of the watch movement, and first and second reset means for respectively setting the said first and second counters independently of each other from outside the watch.
Claim 2
Dependent Claim
138 words
An electric watch comprising a precise resonator, an oscillator coupled to said resonator, a frequency divider connected to the oscillator, a watch movement including drive means therefor and means coupled to the frequency divider and the drive means of the watch movement for controlling the operation thereof to eliminate errors in indicated time, the latter means comprising a first counter coupled for synchronized operation with said drive means of the watch movement, a second reference counter connected to said divider, comparison means connected to said counters for comparing the states thereof and coupled to said drive means of the watch movement for maintaining the counters in phase while varying the speed of the watch movement, and first and second reset means for respectively setting the said first and second counters independently of each other from outside the watch.
Claim 3
Dependent Claim
86 words
An electric watch as claimed in claim 1 wherein said drive means of the watch movement includes a step motor coupled with and periodically supplied with impulses from said divider, gating means for selectively passing impulses from said divider to said drive means of the watch movement, said comparison means being connected to said gating means to act thereon to control the feed of impulses from the divider to the motor to adjust the speed of the motor until the first and second counters are equal.
Claim 4
Dependent Claim
83 words
An electric watch as claimed in claim 2 wherein said comparison means comprises a comparator connected to said first and second counters and a pair of exclusive OR gates the first being connected to said first and second counters and the second to the output of the first exclusive OR gate and to said comparator, said gating means comprising a further gate connected between said motor and said divider, said further gate being connected to and controlled by said second exclusive OR gate.
Claim 5
Dependent Claim
31 words
An electric watch as claimed in claim 3 said first and second reset means comprising reset switches respectively connected to said first and second counters to reset the same to zero.
Claim 6
Dependent Claim
83 words
An electric watch as claimed in claim 1 wherein said means for controlling the drive means of the watch movement comprises means for applying energy to said drive means to vary the speed of operation thereof, this said means also receiving impulses from said drive means and feeding the same to said first counter and back to said drive means under the control of said comparison means to effect speed change of the watch movement until the first and second counters are equalized.
Claim 7
Dependent Claim
71 words
An electric watch as claimed in claim 5 wherein said comparison means comprises a comparator connected to said first and second counters and a pair of exclusive OR gates, the first being connected to said first and second counters and the second to said comparator and to the output of the first exclusive OR gate, and a further gate connected to said drive means and to said second exclusive OR gate.
Claim 8
Dependent Claim
25 words
An electric watch as claimed in claim 6 comprising reset switches respectively connected to said first and second counters to reset the same to zero.