US3218462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current amplifier
Assignee: International Business Machines Corp
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Filing: 1961-11-29
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Granted: 1965-11-16
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Expires: 1981-11-29
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Raub
- 👤 James E Taunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:39
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A CIRCUIT FOR AMPLIFYING THE ELECTRICAL SIGNAL PRODUCED BY A PHOTO-RESPONSIVE SEMICONDUCTOR ELEMENT IN RESPONSE TO LIGHT FALLING THEREON FROM A SOURCE, THE COMBINATION COMPRISING: A VOLTAGE SUPPLY HAVING FIRST AND SECOND TERMINALS OF OPPOSITE POLARITY; AN OUTPUT TERMINAL; A TRANSISTOR HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE WITH SAID EMITTER ELECTRODE CONNECTED TO SAID OUTPUT TERMINAL AND SAID COLLECTOR ELECTRODE CONNECTED TO SAID FIRST SUPPLY TERMINAL; A FIRST RESISTOR CONNECTED BETWEEN SAID FIRST TERMINAL AND SAID BASE ELECTRODE; A SECOND RESISTOR CONNECTED BETWEEN THE JUNCTION OF SAID EMITTER ELECTRODE AND OUTPUT TERMINAL AND SAID SECOND SUPPLY TERMINAL; AND A PHOTO-RESPONSIVE SEMICONDUCTOR ELEMENT CONNECTED BETWEEN SAID BASE ELECTRODE AND SAID EMITTER ELECTRODE FOR SUPPLYING A VARIABLE ELECTRICAL SIGNAL BETWEEN SAID BASE AND EMITTER ELECTRODE IN RESPONSE TO THE QUANTITY OF LIGHT FALLING ON SAID ELEMENT, WHEREBY THE SIGNAL BETWEEN SAID OUTPUT TERMINAL AND SAID SECOND SUPPLY TERMINAL IS AN AMPLIFICATION OF SAID VARIABLE SIGNAL.
Claim 2
Dependent Claim
158 words
A CIRCUIT FOR AMPLIFYING THE ELECTRICAL SIGNAL PRODUCED BY A PHOTO-RESPONSIVE SEMICONDUCTOR ELEMENT IN RESPONSE TO LIGHT FALLING THEREON FROM A SOURCE, THE COMBINATION COMPRISING: A VOLTAGE SUPPLY HAVING FIRST AND SECOND TERMINALS OF OPPOSITE POLARITY; AN OUTPUT TERMINAL; A TRANSISTOR HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE WITH SAID EMITTER ELECTRODE CONNECTED TO SAID OUTPUT TERMINAL AND SAID COLLECTOR ELECTRODE CONNECTED TO SAID FIRST SUPPLY TERMINAL; A FIRST RESISTOR CONNECTED BETWEEN SAID FIRST TERMINAL AND SAID BASE ELECTRODE; A SECOND RESISTOR CONNECTED BETWEEN THE JUNCTION OF SAID EMITTER ELECTRODE AND OUTPUT TERMINAL AND SAID SECOND SUPPLY TERMINAL; AND A PHOTO-RESPONSIVE SEMICONDUCTOR ELEMENT CONNECTED BETWEEN SAID BASE ELECTRODE AND SAID EMITTER ELECTRODE FOR SUPPLYING A VARIABLE ELECTRICAL SIGNAL BETWEEN SAID BASE AND EMITTER ELECTRODE IN RESPONSE TO THE QUANTITY OF LIGHT FALLING ON SAID ELEMENT, WHEREBY THE SIGNAL BETWEEN SAID OUTPUT TERMINAL AND SAID SECOND SUPPLY TERMINAL IS AN AMPLIFICATION OF SAID VARIABLE SIGNAL.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |