US3144604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor thermal impedance test set employing a bridging type mercury relay
Assignee: AT&T Inc
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Filing: 1960-06-27
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Granted: 1964-08-11
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Expires: 1980-06-27
Abstract
No abstract record available.
Inventors
- 👤 Grant F Stetzier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/26; G01R31/2607; G01R31/2608; G01R31/2619
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A TRANSISTOR THERMAL IMPEDANCE TEST SET COMPRISING IN COMBINATION A RELAY HAVING MERCURY-WETTED CONTACTS WHICH MOMENTARILY PHYSICALLY AND ELECTRICALLY JOIN TOGETHER WHEN THE RELAY IS ACTUATED, MEANS FOR APPLYING BASE BIAS TO THE TRANSISTOR UNDER TEST, ONE SIDE OF SAID BASE BIAS MEANS BEING CONNECTED TO A FIRST CONTACT OF THE RELAY AND TO THE TRANSISTOR BASE, MEANS FOR APPLYING COLLECTOR BIAS TO THE TRANSISTOR, ONE SIDE OF SAID COLLECTOR BIAS MEANS BEING CONNECTED TO THE TRANSISTOR COLLECTOR AND THE OTHER SIDE THEREOF BEING CONNECTED TO GROUND, A SECOND CONTACT OF THE RELAY CONNECTED TO THE TRANSISTOR EMITTER, A THIRD CONTACT OF THE RELAY CONNECTED TO GROUND, A FOURTH CONTACT OF THE RELAY BEING THE ARMATURE CONTACT CONNECTED TO THE OTHER SIDE OF THE BASE BIAS MEANS, A
Claim 2
Dependent Claim
128 words
A TRANSISTOR THERMAL IMPEDANCE TEST SET COMPRISING IN COMBINATION A RELAY HAVING MERCURY-WETTED CONTACTS WHICH MOMENTARILY PHYSICALLY AND ELECTRICALLY JOIN TOGETHER WHEN THE RELAY IS ACTUATED, MEANS FOR APPLYING BASE BIAS TO THE TRANSISTOR UNDER TEST, ONE SIDE OF SAID BASE BIAS MEANS BEING CONNECTED TO A FIRST CONTACT OF THE RELAY AND TO THE TRANSISTOR BASE, MEANS FOR APPLYING COLLECTOR BIAS TO THE TRANSISTOR, ONE SIDE OF SAID COLLECTOR BIAS MEANS BEING CONNECTED TO THE TRANSISTOR COLLECTOR AND THE OTHER SIDE THEREOF BEING CONNECTED TO GROUND, A SECOND CONTACT OF THE RELAY CONNECTED TO THE TRANSISTOR EMITTER, A THIRD CONTACT OF THE RELAY CONNECTED TO GROUND, A FOURTH CONTACT OF THE RELAY BEING THE ARMATURE CONTACT CONNECTED TO THE OTHER SIDE OF THE BASE BIAS MEANS, A
References Cited (Backward Citations)
US2872644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |