US3418492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic gates
Assignee: Westinghouse Electric Corp
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Filing: 1965-08-09
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Granted: 1968-12-24
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Expires: 1985-08-09
Abstract
No abstract record available.
Inventors
- 👤 Lin Hung Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:09
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/01; H03K19/013; H03K19/0136; H03K19/02; H03K19/08; H03K19/082; H03K19/084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A LOGIC CIRCUIT COMPRISING: (A) A CIRCUIT POINT; (B) INPUT MEANS CONNECTED TO SAID CIRCUIT POINT FOR SIMULTANEOUSLY RECEIVING A PLURALITY OF BINARY INPUT SIGNALS; (C) OUTPUT TRANSISTOR MEANS OF ONE CONDUCTIVITY TYPE AND INCLUDING A BASE, EMITTER AND COLLECTOR ELECTRODE AND OPERABLE IN AN ON AND OFF CONDITION DEPENDING UPON THE COMBINATION OF SAID BINARY INPUT SIGNALS; (D) OUTPUT TERMINAL MEANS CONNECTED TO SAID OUTPUT TRANSISTOR MEANS FOR PROVIDING AN OUTPUT SIGNAL; (E) FIRST TRANSISTOR MEANS OF CONDUCTIVITY TYPE OPPOSITE SAID OUTPUT TRANSISTOR AND CONNECTED TO SAID OUTPUT TRANSISTOR MEANS FOR PROVIDING SAID OUTPUT TRANSISTOR WITH BASE AND COLLECTOR CURRENT; (F) SECOND TRANSISTOR MEANS RESPONSIVE TO A PREDETERMINED CHANGE IN VOLTAGE LEVEL AT SAID CIRCUIT POINT, AS OPPOSED TO THE LEVEL AFTER IT CHANGES, FOR PROVIDING A SURGE OF CURRENT TO SAID OUTPUT TERMINAL MEANS WHEN SAID OUTPUT TRANSISTOR MEANS SWITCHES FROM AN ON TO AN OFF CONDITION.
Claim 2
Dependent Claim
149 words
A LOGIC CIRCUIT COMPRISING: (A) A CIRCUIT POINT; (B) INPUT MEANS CONNECTED TO SAID CIRCUIT POINT FOR SIMULTANEOUSLY RECEIVING A PLURALITY OF BINARY INPUT SIGNALS; (C) OUTPUT TRANSISTOR MEANS OF ONE CONDUCTIVITY TYPE AND INCLUDING A BASE, EMITTER AND COLLECTOR ELECTRODE AND OPERABLE IN AN ON AND OFF CONDITION DEPENDING UPON THE COMBINATION OF SAID BINARY INPUT SIGNALS; (D) OUTPUT TERMINAL MEANS CONNECTED TO SAID OUTPUT TRANSISTOR MEANS FOR PROVIDING AN OUTPUT SIGNAL; (E) FIRST TRANSISTOR MEANS OF CONDUCTIVITY TYPE OPPOSITE SAID OUTPUT TRANSISTOR AND CONNECTED TO SAID OUTPUT TRANSISTOR MEANS FOR PROVIDING SAID OUTPUT TRANSISTOR WITH BASE AND COLLECTOR CURRENT; (F) SECOND TRANSISTOR MEANS RESPONSIVE TO A PREDETERMINED CHANGE IN VOLTAGE LEVEL AT SAID CIRCUIT POINT, AS OPPOSED TO THE LEVEL AFTER IT CHANGES, FOR PROVIDING A SURGE OF CURRENT TO SAID OUTPUT TERMINAL MEANS WHEN SAID OUTPUT TRANSISTOR MEANS SWITCHES FROM AN ON TO AN OFF CONDITION.
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |