US3248561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic circuit
Assignee: International Business Machines Corp
•
Filing: 1962-04-20
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Granted: 1966-04-26
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Expires: 1982-04-20
Abstract
No abstract record available.
Inventors
- 👤 James L Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:30
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/08; H03K19/082; H03K19/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A SWITCHING CIRCUIT COMPRISING AT LEAST ONE FIRST TRANSISTOR HAVING FIRST BASE, FIRST EMITTER AND FIRST COLLECTOR ELECTRODES, A SECOND TRANSISTOR HAVING SECOND BASE, SECOND EMITTER AND SECOND COLLECTOR ELECTRODES, A THIRD TRANSISTOR HAVING THIRD BASE, THIRD EMITTER AND THIRD COLLECTOR ELECTRODES, A CURRENT SUPPLY, THE FIRST EMITTER, SECOND COLLECTOR AND THIRD BASE ELECTRODES CONNECTED TO A COMMON JUNCTION, THE SECOND EMITTER AND THIRD EMITTER CONNECTED TO THE CURRENT SUPPLY, THE SECOND BASE ELECTRODE CONNECTED TO A SOURCE OF REFERENCE POTENTIAL, THE FIRST COLLECTOR ELECTRODES CONNECTED TO A SUPPLY VOLTAGE, SIGNAL INPUT MEANS CONNECTED TO THE FIRST BASE ELECTRODES, AND LOAD CIRCUIT MEANS INCLUDING AN OUTPUT CIRCUIT CONNECTED TO THE THIRD COLLECTOR ELECTRODE.
Claim 2
Dependent Claim
113 words
A SWITCHING CIRCUIT COMPRISING AT LEAST ONE FIRST TRANSISTOR HAVING FIRST BASE, FIRST EMITTER AND FIRST COLLECTOR ELECTRODES, A SECOND TRANSISTOR HAVING SECOND BASE, SECOND EMITTER AND SECOND COLLECTOR ELECTRODES, A THIRD TRANSISTOR HAVING THIRD BASE, THIRD EMITTER AND THIRD COLLECTOR ELECTRODES, A CURRENT SUPPLY, THE FIRST EMITTER, SECOND COLLECTOR AND THIRD BASE ELECTRODES CONNECTED TO A COMMON JUNCTION, THE SECOND EMITTER AND THIRD EMITTER CONNECTED TO THE CURRENT SUPPLY, THE SECOND BASE ELECTRODE CONNECTED TO A SOURCE OF REFERENCE POTENTIAL, THE FIRST COLLECTOR ELECTRODES CONNECTED TO A SUPPLY VOLTAGE, SIGNAL INPUT MEANS CONNECTED TO THE FIRST BASE ELECTRODES, AND LOAD CIRCUIT MEANS INCLUDING AN OUTPUT CIRCUIT CONNECTED TO THE THIRD COLLECTOR ELECTRODE.
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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |