Patent US3248561A successfully refreshed from Google Patents.
US3248561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic circuit
Assignee: International Business Machines Corp
•
Filing: 1962-04-20
•
Granted: 1966-04-26
•
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 18:51
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)
US2919355A
Cited
US2903604A
Cited
US2973437A
Cited
US2986650A
Cited
US2951951A
Cited
US2986651A
Cited
US2943282A
Cited
US3007060A
Cited
US3061671A
Cited
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 |