US3573492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise immunity circuit
Assignee: RCA Licensing Corp
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Filing: 1969-06-02
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Granted: 1971-04-06
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Expires: 1989-06-02
Abstract
Abstract A remote control system includes a noise immunity circuit providing a short duration pulse output in response to an input signal of a predetermined duration. The circuit includes a capacitor which is initially discharged and thereafter charged through a first charging path. When the capacitor becomes charged to a predetermined level, a multivibrator circuit is triggered and provides a second charging path for the capacitor. An output stage is coupled to the multivibrator to provide an output pulse to remote control circuits when the multivibrator is triggered.
Inventors
- 👤 Thomas Austin Bridgewater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:10
CPC Classifications
G; G08; G08C; G08C23/00; G08C23/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
An electrical circuit for producing output pulses in response to desired input signals of predetermined duration which may be accompanied by undesired signals of less duration than said predetermined duration; a capacitor; operating potential supply means; first switch means responsive to said input signals for completing a first charging circuit path including said capacitor and said operating potential supply means; second switch means coupled to said first switch means, said second switch means being momentarily operative to provide a low impedance path across said capacitor when said first switching means completes said charging circuit path; and third switch means coupled to said capacitor and responsive to a predetermined level of voltage across said capacitor for completing a second charging current path including said capacitor and said operating potential supply means which is independent of said first charging circuit path, the time duration for charging said capacitor to said predetermined level of voltage being substantially equal to said predetermined duration.
Claim 2
Dependent Claim
159 words
An electrical circuit for producing output pulses in response to desired input signals of predetermined duration which may be accompanied by undesired signals of less duration than said predetermined duration; a capacitor; operating potential supply means; first switch means responsive to said input signals for completing a first charging circuit path including said capacitor and said operating potential supply means; second switch means coupled to said first switch means, said second switch means being momentarily operative to provide a low impedance path across said capacitor when said first switching means completes said charging circuit path; and third switch means coupled to said capacitor and responsive to a predetermined level of voltage across said capacitor for completing a second charging current path including said capacitor and said operating potential supply means which is independent of said first charging circuit path, the time duration for charging said capacitor to said predetermined level of voltage being substantially equal to said predetermined duration.
Claim 3
Dependent Claim
28 words
An electric circuit as defined in claim 1 wherein said first switch means includes a transistor having its collector-emitter current path connected in said first charging circuit path.
Claim 4
Dependent Claim
31 words
An electric circuit as defined in claim 2 including a fourth mechanically actuated switch means connected for completing a third charging path including said capacitor and said operating potential supply means.
Claim 5
Dependent Claim
26 words
An electric circuit as defined in claim 1 wherein said second switch means is a transistor having its collector-emitter electrode current path coupled across said capacitor.
Claim 6
Dependent Claim
16 words
An electric circuiT as defined in claim 4 wherein said third switch means includes a multivibrator.
Claim 7
Dependent Claim
31 words
An electric circuit as defined in claim 5 including means coupled to said third switch means for providing a pulse output after said capacitor charges to said predetermined level of voltage.
Claim 8
Dependent Claim
39 words
An electric circuit as defined in claim 1 wherein said third switch means includes a multivibrator, and means coupled to said third switch means for providing a pulse output after said capacitor charges to said predetermined level of voltage.
Claim 9
Dependent Claim
51 words
An electric circuit as defined in claim 7 wherein said first switch means includes a transistor having its collector-emitter current path connected in said first charging circuit path, and a fourth mechanically actuated switch means connected for completing a third charging path including said capacitor and said operating potential supply means.
References Cited (Backward Citations)
US3414735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |