US3165725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protected amplifying device
Assignee: AT&T Inc
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Filing: 1960-12-28
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Granted: 1965-01-12
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Expires: 1980-12-28
Abstract
No abstract record available.
Inventors
- 👤 Francis C Kelcourse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:05
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN COMBINATION, A PLURALITY OF TRANSISTORS, EACH OF SAID TRANSISTORS HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, MEANS FOR CONNECTING THE COLLECTOR OF EACH OF SAID TRANSISTORS TO A FIRST COMMON CONDUCTOR, A PLURALITY OF FUSIBLE ELEMENTS EACH CONNECTING THE EMITTER ELECTRODE OF ONE OF SAID TRANSISTORS TO A SECOND COMMON CONDUCTOR, A VOLTAGE SOURCE FOR ESTABLISHING A POTENTIAL DIFFERENCE BETWEEN SAID FIRST AND SECOND COMMON CONDUCTORS, AN INPUT TERMINAL, A SOURCE OF INPUT SIGNALS EFFECTIVELY CONNECTED BETWEEN SAID INPUT TERMINAL AND SAID SECOND COMMON CONDUCTOR, A PLURALITY OF DIODES EACH CONNECTING SAID INPUT TERMINAL TO THE BASE ELECTRODE OF ONE OF SAID TRANSISTORS, SAID DIODES BEING POLED IN A DIRECTION APPROPRIATE
Claim 2
Dependent Claim
111 words
IN COMBINATION, A PLURALITY OF TRANSISTORS, EACH OF SAID TRANSISTORS HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, MEANS FOR CONNECTING THE COLLECTOR OF EACH OF SAID TRANSISTORS TO A FIRST COMMON CONDUCTOR, A PLURALITY OF FUSIBLE ELEMENTS EACH CONNECTING THE EMITTER ELECTRODE OF ONE OF SAID TRANSISTORS TO A SECOND COMMON CONDUCTOR, A VOLTAGE SOURCE FOR ESTABLISHING A POTENTIAL DIFFERENCE BETWEEN SAID FIRST AND SECOND COMMON CONDUCTORS, AN INPUT TERMINAL, A SOURCE OF INPUT SIGNALS EFFECTIVELY CONNECTED BETWEEN SAID INPUT TERMINAL AND SAID SECOND COMMON CONDUCTOR, A PLURALITY OF DIODES EACH CONNECTING SAID INPUT TERMINAL TO THE BASE ELECTRODE OF ONE OF SAID TRANSISTORS, SAID DIODES BEING POLED IN A DIRECTION APPROPRIATE
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) | 1968-01-12 | 1968-07-13 | 1969-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-12 | 1972-07-13 | 1973-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-12 | 1976-07-13 | 1977-01-12 | $7700.00 | Window Closed / Lapsed |