US3131309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier-switching circuit with zener diode limiting for elimination of unattenuated signals
Assignee: Westinghouse Air Brake Co
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Filing: 1958-10-30
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Granted: 1964-04-28
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Expires: 1978-10-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas J Blocher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:16
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A SWITCHING CIRCUIT ARRANGED TO BE CONNECTED TO OPERATING MEANS, SAID SWITCHING CIRCUIT COMPRISING A CONDUCTIVE DEVICE INCLUDING A PLURALITY OF ELECTRODES, A PLURALITY OF IMPEDANCES CONNECTED IN A CIRCUIT PATH INCLUDING AT LEAST A PAIR OF SAID ELECTRODES AND SAID OPERATING MEANS, MEANS FOR APPLYING AN INPUT SIGNAL TO SAID CONDUCTIVE DEVICE, AND OUTPUT SIGNAL COUPLED FROM A FIRST OF SAID IMPEDANCES, A ZENER TYPE DIODE CONNECTED IN PARALLEL WITH AT LEAST SAID FIRST IMPEDANCE AND POLED TO PRESENT A HIGH RESISTANCE TO CURRENT FLOWING IN THE NORMAL DIRECTION THROUGH
Claim 2
Dependent Claim
91 words
A SWITCHING CIRCUIT ARRANGED TO BE CONNECTED TO OPERATING MEANS, SAID SWITCHING CIRCUIT COMPRISING A CONDUCTIVE DEVICE INCLUDING A PLURALITY OF ELECTRODES, A PLURALITY OF IMPEDANCES CONNECTED IN A CIRCUIT PATH INCLUDING AT LEAST A PAIR OF SAID ELECTRODES AND SAID OPERATING MEANS, MEANS FOR APPLYING AN INPUT SIGNAL TO SAID CONDUCTIVE DEVICE, AND OUTPUT SIGNAL COUPLED FROM A FIRST OF SAID IMPEDANCES, A ZENER TYPE DIODE CONNECTED IN PARALLEL WITH AT LEAST SAID FIRST IMPEDANCE AND POLED TO PRESENT A HIGH RESISTANCE TO CURRENT FLOWING IN THE NORMAL DIRECTION THROUGH
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |