Patent US3274335A successfully refreshed from Google Patents.
US3274335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Facsimile automatic background control
Assignee: Stewart Warner Corp
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Filing: 1963-07-08
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Granted: 1966-09-20
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Expires: 1983-07-08
Abstract
No abstract record available.
Inventors
- 👤 Gray Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:43
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/4076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A SYSTEM FOR CONVERTING LIGHT VARIATIONS IN INTO ELECTRIC SIGNALS, THE COMBINATION OF A PHOTOELECTRIC DEVICE, MEANS FOR DIRECTING LIGHT TO BE CONVERTED INTO SAID PHOTOELECTRIC DEVICE, A SUBCARRIER-FREQUENCY SIGNAL SOURCE, A MODULATOR CIRCUIT IN WHICH THE OUTPUT SIGNAL OF SAID PHOTOELECTRIC DEVICE MODULATED THE SUBCARRIER-FREQUENCY SIGNAL, VARIABLE GAIN AMPLIFYING MEANS FOR AMPLIFYING THE MODULATED SIGNAL, MEANS RESPONSIVE TO THE MAXIMUM AMPLITUDE PEAKS OF SAID AMPLIFIER OUTPUT FOR INVERSELY AFFECTING THE GAIN OF SAID AMPLIFYING MEANS, AND MEANS INCLUDING SAID SUBCARRIER SIGNAL SOURCE FOR SUMMING THE AMPLIFIED MODULATED SIGNAL WITH A CONSTANT AMPLITUDE OPPOSITELY PHASED CARRIER-FREQUENCY SIGNAL, WHEREBY THE AMPLITUDE OF THE SUMMATION SIGNAL IS INDICATIVE OF SAID LIGHT VARIATIONS.
Claim 2
Dependent Claim
111 words
IN A SYSTEM FOR CONVERTING LIGHT VARIATIONS IN INTO ELECTRIC SIGNALS, THE COMBINATION OF A PHOTOELECTRIC DEVICE, MEANS FOR DIRECTING LIGHT TO BE CONVERTED INTO SAID PHOTOELECTRIC DEVICE, A SUBCARRIER-FREQUENCY SIGNAL SOURCE, A MODULATOR CIRCUIT IN WHICH THE OUTPUT SIGNAL OF SAID PHOTOELECTRIC DEVICE MODULATED THE SUBCARRIER-FREQUENCY SIGNAL, VARIABLE GAIN AMPLIFYING MEANS FOR AMPLIFYING THE MODULATED SIGNAL, MEANS RESPONSIVE TO THE MAXIMUM AMPLITUDE PEAKS OF SAID AMPLIFIER OUTPUT FOR INVERSELY AFFECTING THE GAIN OF SAID AMPLIFYING MEANS, AND MEANS INCLUDING SAID SUBCARRIER SIGNAL SOURCE FOR SUMMING THE AMPLIFIED MODULATED SIGNAL WITH A CONSTANT AMPLITUDE OPPOSITELY PHASED CARRIER-FREQUENCY SIGNAL, WHEREBY THE AMPLITUDE OF THE SUMMATION SIGNAL IS INDICATIVE OF SAID LIGHT VARIATIONS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |