US3737732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time delay relay
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1971-08-30
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Granted: 1973-06-05
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Expires: 1991-08-30
Abstract
Abstract A time delay relay of the type in which a semiconductor switching element is made conductive after a predetermined time by a RC time constant circuit so as to actuate a relay connected in series with the semiconductor switching element with respect to a power source. The RC time constant circuit is connected to the semiconductor switching element through a transistor element and, among leakage current of the semiconductor switching element, the current flowing through resistor of the RC time constant circuit is restrained to be low utilizing amplifying action of the transistor element, thereby enabling a delaying action for a long time period.
Inventors
- 👤 H Suemasa
- 👤 K Honda
- 👤 K Yoda
- 👤 T Hanahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:24
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/35; H03K3/352; H03K17/00; H03K17/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A time delay relay comprising a first series circuit including a timing resistor and a timing capacitor, a second series circuit including a pair of resistors connected in parallel with said first series circuit, a D.C. source connected across each of said series circuits, a first transistor element having its base connected between said timing resistor and said timing capacitor and its collector connected between the two resistors in said second series circuit, and a second transistor element having its base connected to the emitter of said first transistor element, a relay winding connected between the collector of said second transistor element and the resistor end of said first series circuit, and a semiconductor switching element connected between the emitter of said second transistor element and the capacitor end of said first series circuit.
Claim 2
Dependent Claim
134 words
A time delay relay comprising a first series circuit including a timing resistor and a timing capacitor, a second series circuit including a pair of resistors connected in parallel with said first series circuit, a D.C. source connected across each of said series circuits, a first transistor element having its base connected between said timing resistor and said timing capacitor and its collector connected between the two resistors in said second series circuit, and a second transistor element having its base connected to the emitter of said first transistor element, a relay winding connected between the collector of said second transistor element and the resistor end of said first series circuit, and a semiconductor switching element connected between the emitter of said second transistor element and the capacitor end of said first series circuit.
Claim 3
Dependent Claim
72 words
A time delay relay as defined in claim 1 wherein a discharging resistor is connected between the collector of said first transistor element and the capacitor end of said first series circuit, so that a discharging by-pass for residual charges of the timing capacitor is formed through the base and emitter of the first transistor element and said discharging resistor when the timing operation is interrupted before completion of the timing period.
Claim 4
Dependent Claim
49 words
A time delay relay according to claim 1, in which said semiconductor switching element is a three terminal semiconductor switching element, and a capacitor for maintaining conduction of the switching element is connected between the gate electrode of said semiconductor switching element and the base of the transistor element.
Claim 5
Dependent Claim
45 words
A time delay relay according to claim 1 in which said semiconductor switching element is a three terminal semiconductor switching element, and a capacitor for maintaining conduction of the switching element is connected between the gate electrode and the anode electrode of the switching element.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |