US3327239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-terminal direct-current amplifier
Assignee: Individual
•
Filing: 1964-01-06
•
Granted: 1967-06-20
•
Expires: 1984-01-06
Abstract
No abstract record available.
Inventors
- 👤 Robert J Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:56
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A FOUR-TERMINAL DIRECT-CURRENT AMPLIFIER COMPRISING, A PAIR OF INPUT TERMINALS, A PAIR OF OUTPUT TERMINALS, FIRST AND SECOND DIRECT-CURRENT AMPLIFYING STAGES, A LAMP CONNECTED TO THE OUTPUT OF SAID FIRST DIRECT-CURRENT AMPLIFYING STAGE. FIRST AND SECOND SUBSTANTIALLY IDENTICAL PHOTOSENSITIVE CELLS DISPOSED TO RECEIVE SUBSTANTIALLY IDENTICAL AMOUNTS OF ILLUMINATION FROM SAID LAMP, MEANS FOR DERIVING A FIRST DIRECT-CURRENT SIGNAL FROM SAID FIRST PHOTOSENTITVE CELL, MEANS FOR FEEDING SAID FIRST DIRECT-CURRENT SIGNAL TO THE INPUT OF SAID SECOND DIRECT-CURRENT AMPLIFYING STAGE, THE OUTPUT OF SAID SECOND DIRECT-CURRENT AMPLIFYING STAGE BEING CONNECTED TO SAID PAIR OF OUTPUT TERMINALS MEANS FOR DERIVING A SECOND DIRECT-CURRENT SIGNAL FROM SAID SECOND PHOTOSENSITIVE CELL, AND MEANS FOR CONNECTING A PORTION OF SAID SECOND DIRECT-CURRENT SIGNAL IN SERIES WITH SAID PAIR OF INPUT TERMINALS AND THE INPUT OF SAID FIRST DIRECT-CURRENT AMPLIFYING STAGE.
Claim 2
Dependent Claim
135 words
A FOUR-TERMINAL DIRECT-CURRENT AMPLIFIER COMPRISING, A PAIR OF INPUT TERMINALS, A PAIR OF OUTPUT TERMINALS, FIRST AND SECOND DIRECT-CURRENT AMPLIFYING STAGES, A LAMP CONNECTED TO THE OUTPUT OF SAID FIRST DIRECT-CURRENT AMPLIFYING STAGE. FIRST AND SECOND SUBSTANTIALLY IDENTICAL PHOTOSENSITIVE CELLS DISPOSED TO RECEIVE SUBSTANTIALLY IDENTICAL AMOUNTS OF ILLUMINATION FROM SAID LAMP, MEANS FOR DERIVING A FIRST DIRECT-CURRENT SIGNAL FROM SAID FIRST PHOTOSENTITVE CELL, MEANS FOR FEEDING SAID FIRST DIRECT-CURRENT SIGNAL TO THE INPUT OF SAID SECOND DIRECT-CURRENT AMPLIFYING STAGE, THE OUTPUT OF SAID SECOND DIRECT-CURRENT AMPLIFYING STAGE BEING CONNECTED TO SAID PAIR OF OUTPUT TERMINALS MEANS FOR DERIVING A SECOND DIRECT-CURRENT SIGNAL FROM SAID SECOND PHOTOSENSITIVE CELL, AND MEANS FOR CONNECTING A PORTION OF SAID SECOND DIRECT-CURRENT SIGNAL IN SERIES WITH SAID PAIR OF INPUT TERMINALS AND THE INPUT OF SAID FIRST DIRECT-CURRENT AMPLIFYING STAGE.
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) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |