Patent US2702149A successfully refreshed from Google Patents.
Patent US3424908A successfully refreshed from Google Patents.
US3424908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier for photocell
Assignee: General Electric Co
•
Filing: 1966-10-19
•
Granted: 1969-01-28
•
Expires: 1986-10-19
Abstract
No abstract record available.
Inventors
- 👤 David N Sitter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:44
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/08; G; G01; G01J; G01J1/00; G01J1/42; G01J1/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
AN AMPLIFIER FOR A PHOTOCELL COMPRISING A TRANSISTOR HAVING ITS EMITTER COUPLED TO SAID PHOTOCELL, BIAS MEANS COUPLED TO THE BASE OF SAID TRANSISTOR TO FORWARD BIAS SAID TRANSISTOR AND REVERSE BIAS SAID PHOTOCELL, AND A RESISTOR COUPLED TO THE COLLECTOR OF SAID TRANSISTOR AND FORMING A SERIES CIRCUIT WITH SAID TRANSISTOR, SAID PHOTOCELL AND THE DIRECT VOLTAGE SOURCE COUPLED THERETO DURING OPERATION, SAID RESISTOR RECEIVING THE CURRENT GENERATED BY SAID PHOTOCELL IN RESPONSE TO LIGHT IMPINGING THEREON AND DEVELOPING A VOLTAGE PROPORTIONAL TO THE CELL CURRENT AND HAVING A MAGNITUDE DETERMINED BY THE SIZE OF SAID RESISTOR.
Claim 2
Dependent Claim
98 words
AN AMPLIFIER FOR A PHOTOCELL COMPRISING A TRANSISTOR HAVING ITS EMITTER COUPLED TO SAID PHOTOCELL, BIAS MEANS COUPLED TO THE BASE OF SAID TRANSISTOR TO FORWARD BIAS SAID TRANSISTOR AND REVERSE BIAS SAID PHOTOCELL, AND A RESISTOR COUPLED TO THE COLLECTOR OF SAID TRANSISTOR AND FORMING A SERIES CIRCUIT WITH SAID TRANSISTOR, SAID PHOTOCELL AND THE DIRECT VOLTAGE SOURCE COUPLED THERETO DURING OPERATION, SAID RESISTOR RECEIVING THE CURRENT GENERATED BY SAID PHOTOCELL IN RESPONSE TO LIGHT IMPINGING THEREON AND DEVELOPING A VOLTAGE PROPORTIONAL TO THE CELL CURRENT AND HAVING A MAGNITUDE DETERMINED BY THE SIZE OF SAID RESISTOR.
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) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |