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US3962565A
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Apparatus for presetting a counter to a given initial count
Assignee: Schlumberger Instruments et Systemes SA
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Filing: 1974-05-06
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Granted: 1976-06-08
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Expires: 1994-05-06
Abstract
Abstract Apparatus for presetting an electric pulse counter to a given count without any action on its parallel input terminals and/or its parallel output terminals. The apparatus comprises a pulse generator which is connected, during a preset operation, to the count input of the counter through an electronic gate. The electronic gate is controlled by an auxiliary circuit. In one embodiment, the auxiliary circuit comprises as many voltage comparators as flip-flops in the counter. The voltage comparators enable the electronic gate as long as the states of the flip-flops are different from the desired states. In another embodiment, the auxiliary circuit mainly comprises a divider by N, N being the desired count. In a first step, the divider is reset and the counter is caused to count up to its maximum count and to deliver an overflow pulse when it resets. In a second step starting with the overflow pulse, both counter and divider count up from zero and the electronic gate is closed when the divider reaches the N-count. Lastly, in a third embodiment, the output of the electronic gate is also connected to a down-counter. The counting is stopped when the counter resets and delivers an overflow pulse. Then, at that time, the counter is reset while the down-counter displays the count which was in the counter at the beginning of the preset operation. The down-counter may be connected to a display unit.
Inventors
- 👤 Boa-Dam N. Guyen-Phuoc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:39
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/64; H03K23/66; H03K23/665; H03K21/00; H03K21/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
Apparatus for automatically presetting an electric pulse counter to a given initial count, comprising first means, triggered by a preset signal, for applying pulses to the input of the counter, and second means, triggered by the overflow pulse appearing at the output of the counter when it resets to cause the application to its input of a number of pulses equal to said initial count.
Claim 2
Dependent Claim
65 words
Apparatus for automatically presetting an electric pulse counter to a given initial count, comprising first means, triggered by a preset signal, for applying pulses to the input of the counter, and second means, triggered by the overflow pulse appearing at the output of the counter when it resets to cause the application to its input of a number of pulses equal to said initial count.
Claim 3
Dependent Claim
60 words
Apparatus according to claim 1 wherein said first means comprise a pulse generator, a flip-flop whose set input receives the preset signal, an AND gate with two inputs respectively connected to the outputs of said generator and said flip-flop, and a switch for connecting during the preset operation the output of said AND gate to the input of the counter.
Claim 4
Dependent Claim
105 words
Apparatus according to claim 2 wherein the second means comprises a flip-flop whose set input is connected to the output of the counter and whose reset input receives the preset signal, an AND gate with two inputs respectively connected to the outputs of said pulse generator and of said flip-flop of said first means, and a counter-divider, dividing by a number equal to the desired initial count, whose input and output are connected to the output of said AND gate of said second means and to the reset input of said flip-flop of said first means, respectively, and whose reset input receives the preset signal.
Claim 5
Dependent Claim
84 words
Apparatus for automatically resetting an electric pulse counter adapted to provide on is output an overflow pulse when it resets, comprising a pulse generator, a flip-flop whose set input receives a reset signal and whose reset input is connected to the output of the counter, an AND gate with two inputs respectively connected to the outputs of said generator and of said flip-flop, and a switch for connecting during the reset operation, the output of said AND gate to the input of the counter.
Claim 6
Dependent Claim
84 words
Apparatus for automatically resetting an electric pulse counter adapted to provide on is output an overflow pulse when it resets, comprising a pulse generator, a flip-flop whose set input receives a reset signal and whose reset input is connected to the output of the counter, an AND gate with two inputs respectively connected to the outputs of said generator and of said flip-flop, and a switch for connecting during the reset operation, the output of said AND gate to the input of the counter.
Claim 7
Dependent Claim
122 words
Apparatus for the display of the count of a counter adapted to provide on its output an overflow signal when it resets comprising a pulse generator, a flip-flop whose set input receives a display signal and whose reset input is connected to the output of the counter, an AND gate with two inputs respectively connected to the outputs of said pulse generator and of said flip-flop, a switch for connecting, during the display operation, the output of said AND gate to the input of the counter, and a down-counter, reset by said display signal, which also receives the pulses applied to the counter, whereby the count in said down-counter when said counter produces an overflow signal is the count to be displayed.
Claim 8
Dependent Claim
122 words
Apparatus for the display of the count of a counter adapted to provide on its output an overflow signal when it resets comprising a pulse generator, a flip-flop whose set input receives a display signal and whose reset input is connected to the output of the counter, an AND gate with two inputs respectively connected to the outputs of said pulse generator and of said flip-flop, a switch for connecting, during the display operation, the output of said AND gate to the input of the counter, and a down-counter, reset by said display signal, which also receives the pulses applied to the counter, whereby the count in said down-counter when said counter produces an overflow signal is the count to be displayed.
Claim 9
Dependent Claim
81 words
Apparatus for displaying a count stored in a counter without interrogating the status of the individual stages of the counter, comprising: a down-counter having a capacity which corresponds to the capacity of the counter; first means for applying pulses to said counter and said down-counter; and second means, coupled to the output of said counter, for disabling said first means in response to an output of said counter; whereby the final count in said down-counter is the count to be displayed.
Claim 10
Dependent Claim
81 words
Apparatus for displaying a count stored in a counter without interrogating the status of the individual stages of the counter, comprising: a down-counter having a capacity which corresponds to the capacity of the counter; first means for applying pulses to said counter and said down-counter; and second means, coupled to the output of said counter, for disabling said first means in response to an output of said counter; whereby the final count in said down-counter is the count to be displayed.
Claim 11
Dependent Claim
24 words
Apparatus as defined by claim 6 further comprising means for resetting said down-counter prior to the application of said pulses by said first means.
Claim 12
Dependent Claim
181 words
Apparatus for presetting a counter to a predetermined count in response to a preset command signal and for subsequently displaying a final count stored in the counter in response to a display command signal, both operations being effected without the need for coupling to individual stages of the counter, comprising: a counter-divider adapted to divide by a number equal to the predetermined count; a down-counter having a capacity which corresponds to the capacity of the counter; first means responsive to said preset command signal for resetting said counter and for simultaneously applying pulses to said counter and said counter-divider; second means, coupled to the output of said counter-divider for disabling said first means in response to an output of said counter-divider; third means responsive to said display command signal for resetting said down-counter and for simultaneously applying pulses to said counter and said down-counter; and fourth means responsive to the output of said counter, for disabling said third means in response to the output of said counter; whereby the final count in said down-counter is the final count to be displayed.
Claim 13
Dependent Claim
181 words
Apparatus for presetting a counter to a predetermined count in response to a preset command signal and for subsequently displaying a final count stored in the counter in response to a display command signal, both operations being effected without the need for coupling to individual stages of the counter, comprising: a counter-divider adapted to divide by a number equal to the predetermined count; a down-counter having a capacity which corresponds to the capacity of the counter; first means responsive to said preset command signal for resetting said counter and for simultaneously applying pulses to said counter and said counter-divider; second means, coupled to the output of said counter-divider for disabling said first means in response to an output of said counter-divider; third means responsive to said display command signal for resetting said down-counter and for simultaneously applying pulses to said counter and said down-counter; and fourth means responsive to the output of said counter, for disabling said third means in response to the output of said counter; whereby the final count in said down-counter is the final count to be displayed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |