US3829784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching device
Assignee: US Philips Corp
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Filing: 1972-11-29
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Granted: 1974-08-13
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Expires: 1992-11-29
Abstract
Abstract A switching and timing device comprising a series of control points each of which is associated with a combination of switching. Clock pulses cause actuation information to be advanced to control points in sequence, at either low rates for performance of functions, or at high rates to omit functions associated with selected control points. Operation of switching elements is inhibited for high pulse rates.
Inventors
- 👤 K Eshraghian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:26
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/07; D; D06; D06F; D06F34/00; D06F34/08; D06F2101/00; D06F2101/20; D06F2105/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
207 words
A switching device comprising: a shift register comprising a plurality of stages having states which advance in response to timing pulses; a plurality of control points; means for supplyiny actuating information to respective control points in response to the states of said shift register, the intervals between occurrence of consecutive timing pulses determining the period of time for which actuating information is present at the respective control points; a plurality of switching elements; means for actuating a respective combination of switching elements in response to the presence of actuating information at a control point; pulse means for supplying timing pulses to said shift register; program selection means for providing selection information; comparison means for comparing said selection information with actuating information present at the control points; means for controlling a recurrence rate of said timing pulses to recur at either relatively long intervals or relatively short intervals; and inhibition means for preventing the actuation of said switching elements during a time interval of a succession of timing pulses recurring at relatively short intervals, whereby a number of said combinations of switching elements corresponding to a number of control points may be omitted by the supply to the shift register of timing pulses recurring at relatively short intervals.
Claim 2
Dependent Claim
207 words
A switching device comprising: a shift register comprising a plurality of stages having states which advance in response to timing pulses; a plurality of control points; means for supplyiny actuating information to respective control points in response to the states of said shift register, the intervals between occurrence of consecutive timing pulses determining the period of time for which actuating information is present at the respective control points; a plurality of switching elements; means for actuating a respective combination of switching elements in response to the presence of actuating information at a control point; pulse means for supplying timing pulses to said shift register; program selection means for providing selection information; comparison means for comparing said selection information with actuating information present at the control points; means for controlling a recurrence rate of said timing pulses to recur at either relatively long intervals or relatively short intervals; and inhibition means for preventing the actuation of said switching elements during a time interval of a succession of timing pulses recurring at relatively short intervals, whereby a number of said combinations of switching elements corresponding to a number of control points may be omitted by the supply to the shift register of timing pulses recurring at relatively short intervals.
Claim 3
Dependent Claim
54 words
A switching device as claimed in claim 1 wherein said inhibition means includes means for preventing actuation for a period of time greater than the time between timing pulses recurring at relatively short intervals, whereby inhibition is continuous during any time period in which more than two sequential pulses recur at relatively short intervals.
Claim 4
Dependent Claim
33 words
A switching device as claimed in claim 2, comprising in addition means for inhibiting in response to a timing pulse for a period of time commencing prior to advance of said shift register.
Claim 5
Dependent Claim
59 words
A switching device as claimed in claim 3 wherein said pulse means comprises a reference pulse generator producing reference pulses of fixed duration having a leading edge and a trailing edge and wherein said period of inhibition commences in response to the leading edge of a reference pulse and the shift register advances in response to the trailing edge.
Claim 6
Dependent Claim
65 words
A switching device as claimed in claim 1 wherein sad pulse source comprises a relaxation oscillator, having a series combination of two capacitors for determining the repetition frequency, said source further comprising a transistor circuit having a transistor connected to one of said capacitors such that the collector-emitter path shunts said capacitor, so that pulses recur at relatively long intervals when said transistor is conductive.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |