Patent US3689807A successfully refreshed from Google Patents.
US3689807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Put time delay relay
Assignee: Allied Control Co Inc
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Filing: 1971-02-03
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Granted: 1972-09-05
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Expires: 1991-02-03
Abstract
Abstract A time delay relay utilizes a programmable unijunction transistor (PUT) wherein the junction of a resistor-capacitor timing circuit is connected to the gate electrode of the PUT and the coil of an electromechanical relay is connected to the anode of the PUT. The firing of the PUT and consequently the current flow through the relay coil is determined by the anode-gate voltage which exponentially changes from an initial cut off value at the start of the timing interval.
Inventors
- 👤 Mircea M Tenenbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:24
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
A time delay relay comprising a programmable unijunction transistor having anode, cathode and gate electrodes; first and second input terminals; a first series circuit comprising a relay coil and a first resistor connected across said first and second input terminals; a second series circuit comprising a timing capacitor and a timing resistor connected across said first and second input terminals; said anode electrode being connected to the junction of said relay coil and said first resistor, and said cathode electrode being connected to one of said input terminals; and means for connecting said gate electrode to the junction of said timing capacitor and said timing resistor so that the state of conductivity of said transistor controls the flow of current through said relay coil.
Claim 2
Dependent Claim
124 words
A time delay relay comprising a programmable unijunction transistor having anode, cathode and gate electrodes; first and second input terminals; a first series circuit comprising a relay coil and a first resistor connected across said first and second input terminals; a second series circuit comprising a timing capacitor and a timing resistor connected across said first and second input terminals; said anode electrode being connected to the junction of said relay coil and said first resistor, and said cathode electrode being connected to one of said input terminals; and means for connecting said gate electrode to the junction of said timing capacitor and said timing resistor so that the state of conductivity of said transistor controls the flow of current through said relay coil.
Claim 3
Dependent Claim
35 words
The time delay relay of claim 1 wherein said means for connecting said gate electrode to the junction of said timing capacitor and said timing resistor to said gate electrode is a current limiting resistor.
Claim 4
Dependent Claim
26 words
The time delay relay of claim 2 wherein said first resistor is connected across said anode and cathode electrodes to provide a delayed-operating time delay relay.
Claim 5
Dependent Claim
27 words
The time delay relay of claim 2 wherein said relay coil is connected across said anode and cathode electrodes to provide a time interval time delay relay.
Claim 6
Dependent Claim
28 words
The time delay relay of claim 2 further comprising a power supply; and switching means for selectively connecting said power supply across said first and second input terminals.
Claim 7
Dependent Claim
26 words
The time delay relay of claim 5 wherein said first resistor is connected across said anode and cathode electrodes to provide a delayed-operating time delay relay.
Claim 8
Dependent Claim
27 words
The time delay relay of claim 5 wherein said relay coil is Connected across said anode and cathode electrodes to provide a time interval time delay relay.
References Cited (Backward Citations)
US3571665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |