US3303396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delayed pull in time delay relay
Assignee: MASTER SPECIALTIES Co
•
Filing: 1964-01-22
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Granted: 1967-02-07
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Expires: 1984-01-22
Abstract
No abstract record available.
Inventors
- 👤 George T Culbertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:35
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; H03K17/292
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A TIME DELAY RELAY CIRCUIT, COMPRISING, IN COMBINATION, A PAIR OF TERMINALS FOR CONNECTION TO A SOURCE OF DIRECT CURRENT, A FIRST TRANSISTOR HAVING EMITTER, COLLECTOR AND BASE ELECTRODES WITH THE EMITTER-COLLECTOR CIRCUIT CONNECTED IN SERIES WITH A RELAY ACROSS SAID TERMINALS, A TIME DELAY DEVICE HAVING AN INITIAL CONDITION OF NON-CONDUCTION AND INCLUDING A CAPACITOR AND A UNIJUNCTION TRANSISTOR OPERABLY CONNECTED TO SAID TERMINALS TO CONDUCT A PREDETERMINED TIME AFTER APPLICATION OF SAID SOURCE OF DIRECT CURRENT THERETO, SAID TIME DELAY DEVICE OPERATIVELY CONNECTED TO SAID BASE OF SAID FIRST TRANSISTOR WHEREBY DELAYED CONDUCTION BY SAID TIME DELAY DEVICE WILL TURN ON SAID FIRST TRANSISTOR AND WHEREBY CURRENT THROUGH THE EMITTER-COLLECTOR CIRCUIT OF SAID FIRST TRANSISTOR WILL ACTUATE SAID RELAY, A FIRST MEANS RESPONSIVE TO ACTUATION OF SAID RELAY TO DIVERT ADDITIONAL CURRENT FROM SAID TERMINALS TO SAID BASE OF SAID FIRST TRANSISTOR TO HOLD SAID TRANSISTOR ON SAID FIRST MEANS COMPRISING A NORMALLY CLOSED SWITCH CONNECTED IN PARALLEL WITH THE EMITTER BASE CIRCUIT OF SAID
Claim 2
Dependent Claim
167 words
A TIME DELAY RELAY CIRCUIT, COMPRISING, IN COMBINATION, A PAIR OF TERMINALS FOR CONNECTION TO A SOURCE OF DIRECT CURRENT, A FIRST TRANSISTOR HAVING EMITTER, COLLECTOR AND BASE ELECTRODES WITH THE EMITTER-COLLECTOR CIRCUIT CONNECTED IN SERIES WITH A RELAY ACROSS SAID TERMINALS, A TIME DELAY DEVICE HAVING AN INITIAL CONDITION OF NON-CONDUCTION AND INCLUDING A CAPACITOR AND A UNIJUNCTION TRANSISTOR OPERABLY CONNECTED TO SAID TERMINALS TO CONDUCT A PREDETERMINED TIME AFTER APPLICATION OF SAID SOURCE OF DIRECT CURRENT THERETO, SAID TIME DELAY DEVICE OPERATIVELY CONNECTED TO SAID BASE OF SAID FIRST TRANSISTOR WHEREBY DELAYED CONDUCTION BY SAID TIME DELAY DEVICE WILL TURN ON SAID FIRST TRANSISTOR AND WHEREBY CURRENT THROUGH THE EMITTER-COLLECTOR CIRCUIT OF SAID FIRST TRANSISTOR WILL ACTUATE SAID RELAY, A FIRST MEANS RESPONSIVE TO ACTUATION OF SAID RELAY TO DIVERT ADDITIONAL CURRENT FROM SAID TERMINALS TO SAID BASE OF SAID FIRST TRANSISTOR TO HOLD SAID TRANSISTOR ON SAID FIRST MEANS COMPRISING A NORMALLY CLOSED SWITCH CONNECTED IN PARALLEL WITH THE EMITTER BASE CIRCUIT OF SAID
References Cited (Backward Citations)
US3165648A
Cited
US3182277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |