Patent US3857100A successfully refreshed from Google Patents.
US3857100A
Expired / Lapsed
US
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Electronic switching arrangement having a touch contact
Assignee: US Philips Corp
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Filing: 1973-03-23
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Granted: 1974-12-24
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Expires: 1993-03-23
Abstract
Abstract An electronic switching arrangement having a touch contact particularly for switching preselected channels in radio or television receivers. The alternating voltage which occurs across the contact when it is touched is rectified in a rectifier having such a long charge time constant that switching over is effected after a plurality of cycles of the alternating voltage.
Inventors
- 👤 N Baars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:21
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/962; H03J; H03J5/00; H03J5/02; H03J5/0218; H03K17/51; H03K17/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
An electronic switching arrangement having a touch contact, a bistable switching element having an input, a coupling between the touch contact and said input, and an alternating voltage source which is activated when the touch contact is touched for switching over the switching element, characterized in that the said coupling comprises a rectifier circuit for rectifying the alternating voltage and successively a series capacitor, a parallel rectifier element, a series impedance, and a charge capacitor, and said series capacitor has a value which is at least several times lower than that of the charge capacitor, and that the charge time constant of the rectifier circuit is essentially longer than one cycle of the alternating voltage.
Claim 2
Dependent Claim
115 words
An electronic switching arrangement having a touch contact, a bistable switching element having an input, a coupling between the touch contact and said input, and an alternating voltage source which is activated when the touch contact is touched for switching over the switching element, characterized in that the said coupling comprises a rectifier circuit for rectifying the alternating voltage and successively a series capacitor, a parallel rectifier element, a series impedance, and a charge capacitor, and said series capacitor has a value which is at least several times lower than that of the charge capacitor, and that the charge time constant of the rectifier circuit is essentially longer than one cycle of the alternating voltage.
Claim 3
Dependent Claim
23 words
An electronic switching arrangement as claimed in claim 1, characterised in that the said series impedance is constitUted by a second rectifier element.
Claim 4
Dependent Claim
57 words
An electronic switching arrangement as claimed in claim 1, characterized in that said input of the bistable switching element also forms part of the main current path of the switching element and that at least part of the direct current of the switching element flows through the series impedance and the parallel rectifier of the rectifier circuit.
Claim 5
Dependent Claim
71 words
An electronic switching arrangement as claimed in claim 1, characterized in that the rectifier circuit comprises a bridge circuit of impedances having first and second diagonals, means to apply said alternating voltage to the first diagonal, means to rectify said alternating voltage in the second diagonal and means to connect the touch contact to an angular point of the second diagonal for unbalancing the bridge circuit when the contact is touched.
Claim 6
Dependent Claim
34 words
An electronic switching arrangement as claimed in claim 4, characterized in that one of the branches of the bridge circuit comprises the said series impedance and the said charge capacitor of the rectifier circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |