US3170032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Facsimile-scanner with a.g.c. of output signal by multiplication of low and high definition signals
Assignee: AB Dick Co
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Filing: 1961-06-22
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Granted: 1965-02-16
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Expires: 1981-06-22
Abstract
No abstract record available.
Inventors
- 👤 Jr William E Evans
- 👤 Howard E Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4092; H04N1/04; H04N1/113; H04N1/1135; H04N1/407; H04N1/4072
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
APPARATUS FOR DERIVING A VIDEO SIGNAL REPRESENTATIVE OF DATA WRITTEN UPON A DOCUMENT COMPRISING A FIRST AND SECOND FLAT MEMBER EACH HAVING AN APERTURE THERETHROUGH, THE APERTURE IN SAID FIRST FLAT MEMBER BEING SMALL RELATIVE TO THE APERTURE IN SAID SECOND FLAT MEMBER, SCANNING MEANS FOR SUCCESSIVELY DERIVING LIGHT FROM INCREMENTAL AREAS OF SAID DOCUMENT AND FOR DIRECTING THE LIGHT FROM EACH INCREMENTAL AREA UPON BOTH OF SAID APERTURES, FIRST AND SECOND PHOTOMULTIPLIER MEANS RESPECTIVELY POSITIONED OPPOSITE THE APERTURES IN SAID FIRST AND SECOND FLAT MEMBERS FOR CONVERTING THE LIGHT PASSING THERETHROUGH INTO FIRST AND SECOND ELECTRICAL SIGNALS, MEANS FOR APPLYING ONLY SAID SECOND ELECTRICAL SIGNALS TO SAID FIRST AND SECOND PHOTOMULTIPLIER MEANS FOR CONTROLLING THE GAIN THEREOF SOLDLY RESPONSIVE THERETO, AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM SAID FIRST PHOTOMULTIPLIER MEANS.
Claim 2
Dependent Claim
133 words
APPARATUS FOR DERIVING A VIDEO SIGNAL REPRESENTATIVE OF DATA WRITTEN UPON A DOCUMENT COMPRISING A FIRST AND SECOND FLAT MEMBER EACH HAVING AN APERTURE THERETHROUGH, THE APERTURE IN SAID FIRST FLAT MEMBER BEING SMALL RELATIVE TO THE APERTURE IN SAID SECOND FLAT MEMBER, SCANNING MEANS FOR SUCCESSIVELY DERIVING LIGHT FROM INCREMENTAL AREAS OF SAID DOCUMENT AND FOR DIRECTING THE LIGHT FROM EACH INCREMENTAL AREA UPON BOTH OF SAID APERTURES, FIRST AND SECOND PHOTOMULTIPLIER MEANS RESPECTIVELY POSITIONED OPPOSITE THE APERTURES IN SAID FIRST AND SECOND FLAT MEMBERS FOR CONVERTING THE LIGHT PASSING THERETHROUGH INTO FIRST AND SECOND ELECTRICAL SIGNALS, MEANS FOR APPLYING ONLY SAID SECOND ELECTRICAL SIGNALS TO SAID FIRST AND SECOND PHOTOMULTIPLIER MEANS FOR CONTROLLING THE GAIN THEREOF SOLDLY RESPONSIVE THERETO, AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM SAID FIRST PHOTOMULTIPLIER MEANS.
Claim 3
Dependent Claim
97 words
IN A SYSTEM WHEREIN IT IS DESIRED TO OBTAIN AN ELECTRICAL SIGNAL REPRESENTING THE PRODUCT OF TWO LIGHT MODULATIONS, APPARATUS COMPRISING MEANS FOR CONVERTING ONE OF SAID TWO LIGHT MODULATIONS TO A FIRST ELECTRICAL SIGNAL, A PHOTOMULTIPLIER TUBE UPON THE PHOTOCATHODE OF WHICH SAID SECOND LIGHT MODULATION IS DIRECTED, SAID PHOTOMULTIPLIER TUBE HAVING A DYNODE, MEANS TO APPLY OPERATING POTENTIAL TO SAID PHOTOMULTIPLIER TUBE INCLUDING SAID DYNODE, AND MEANS FOR APPLYING SAID FIRST ELECTRICAL SIGNAL TO SAID DYNODE TO MODULATE THE VOLTAGE THEREON WHEREBY THE OUTPUT OF SAID PHOTOMULTIPLIER TUBE IS AN ELECTRICAL SIGNAL REPRESENTING SAID PRODUCT.
Claim 4
Dependent Claim
97 words
IN A SYSTEM WHEREIN IT IS DESIRED TO OBTAIN AN ELECTRICAL SIGNAL REPRESENTING THE PRODUCT OF TWO LIGHT MODULATIONS, APPARATUS COMPRISING MEANS FOR CONVERTING ONE OF SAID TWO LIGHT MODULATIONS TO A FIRST ELECTRICAL SIGNAL, A PHOTOMULTIPLIER TUBE UPON THE PHOTOCATHODE OF WHICH SAID SECOND LIGHT MODULATION IS DIRECTED, SAID PHOTOMULTIPLIER TUBE HAVING A DYNODE, MEANS TO APPLY OPERATING POTENTIAL TO SAID PHOTOMULTIPLIER TUBE INCLUDING SAID DYNODE, AND MEANS FOR APPLYING SAID FIRST ELECTRICAL SIGNAL TO SAID DYNODE TO MODULATE THE VOLTAGE THEREON WHEREBY THE OUTPUT OF SAID PHOTOMULTIPLIER TUBE IS AN ELECTRICAL SIGNAL REPRESENTING SAID PRODUCT.
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) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |