US3241043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyratron tube replacement unit employing a zener diode limiting the inverse voltageacross a gating transistor
Assignee: AT&T Inc
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Filing: 1961-12-22
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Granted: 1966-03-15
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Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 Patrick W Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:05
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/1555; H02M1/00; H02M1/08; H02M1/081; H02M7/1552; H02M7/1557; H02M7/21; H02M7/217; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/725
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A PHASE CONTROLLED THYRATRON TUBE REPLACEMENT UNIT HAVING ANODE, CATHODE AND GRID TERMINALS, A PNPN DEVICE HAVING FIRST, SECOND AND CONTROL ELECTRODES, A TRANSISTOR HAVING BASE, COLLECTOR AND EMITTER ELECTRODES, IMPEDANCE MEANS, A ZENER ASYMMETRICALLY CONDUCTING DEVICE, MEANS FOR CONNECTING THE FIRST ELECTRODE OF SAID PNPN DEVICE TO SAID ANODE TERMINAL, MEANS FOR CONNECTING THE SECOND ELECTRODE OF SAID PNPN DEVICE TO SAID CATHODE TERMINAL, MEANS FOR CONNECTING THE CONTROL ELECTRODE OF SAID PNPN DEVICE TO THE EMITTER ELECTRODE OF SAID TRANSISTOR, MEANS FOR CONNECTING SAID IMPEDANCE MEANS BETWEEN THE ANODE TERMINAL AND THE COLLECTOR ELECTRODE OF SAID TRANSISTOR, MEANS FOR CONNECTING SAID ZENER ASYMMETRICALLY CONDUCTING DEVICE BETWEEN THE CATHODE TERMINAL AND THE COLLECTOR ELECTRODE OF SAID TRANSISTOR, MEANS FOR CONNECTING THE BASE ELECTRODE OF SAID TRANSISTOR TO THE SAID GRID TERMINAL, A SECOND ASYMMETRICALLY CONDUCTING DEVICE, AND MEANS FOR CONNECTING SAID SECOND ASYMMETRICALLY CONDUCTING DEVICE BETWEEN SAID CATHODE AND GRID TERMINALS.
Claim 2
Dependent Claim
152 words
A PHASE CONTROLLED THYRATRON TUBE REPLACEMENT UNIT HAVING ANODE, CATHODE AND GRID TERMINALS, A PNPN DEVICE HAVING FIRST, SECOND AND CONTROL ELECTRODES, A TRANSISTOR HAVING BASE, COLLECTOR AND EMITTER ELECTRODES, IMPEDANCE MEANS, A ZENER ASYMMETRICALLY CONDUCTING DEVICE, MEANS FOR CONNECTING THE FIRST ELECTRODE OF SAID PNPN DEVICE TO SAID ANODE TERMINAL, MEANS FOR CONNECTING THE SECOND ELECTRODE OF SAID PNPN DEVICE TO SAID CATHODE TERMINAL, MEANS FOR CONNECTING THE CONTROL ELECTRODE OF SAID PNPN DEVICE TO THE EMITTER ELECTRODE OF SAID TRANSISTOR, MEANS FOR CONNECTING SAID IMPEDANCE MEANS BETWEEN THE ANODE TERMINAL AND THE COLLECTOR ELECTRODE OF SAID TRANSISTOR, MEANS FOR CONNECTING SAID ZENER ASYMMETRICALLY CONDUCTING DEVICE BETWEEN THE CATHODE TERMINAL AND THE COLLECTOR ELECTRODE OF SAID TRANSISTOR, MEANS FOR CONNECTING THE BASE ELECTRODE OF SAID TRANSISTOR TO THE SAID GRID TERMINAL, A SECOND ASYMMETRICALLY CONDUCTING DEVICE, AND MEANS FOR CONNECTING SAID SECOND ASYMMETRICALLY CONDUCTING DEVICE BETWEEN SAID CATHODE AND GRID TERMINALS.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |