Patent US5890139A successfully refreshed from Google Patents.
Patent US3952222A successfully refreshed from Google Patents.
US3952222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickup tube target
Assignee: RCA Corp
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Filing: 1955-08-10
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Granted: 1976-04-20
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Expires: 1975-08-10
Abstract
Abstract 1. A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said beam, said target electrode comprising a transparent conductive coating, a N-type photoconductor on said coating, a P-type photoconductor on said N-type photoconductor, another N-type photoconductor on said P-type photoconductor, a rectifying junction formed between each adjacent pair of said photoconductors and means for applying a reverse bias across at least one of said junctions.
Inventors
- 👤 Albert Rose
- 👤 Appleton D. Cope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/451; H01J29/456
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said beam, said target electrode comprising a transparent conductive coating, a N-type photoconductor on said coating, a P-type photoconductor on said N-type photoconductor, another N-type photoconductor on said P-type photoconductor, a rectifying junction formed between each adjacent pair of said photoconductors and means for applying a reverse bias across at least one of said junctions.
Claim 2
Dependent Claim
92 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said beam, said target electrode comprising a transparent conductive coating, a N-type photoconductor on said coating, a P-type photoconductor on said N-type photoconductor, another N-type photoconductor on said P-type photoconductor, a rectifying junction formed between each adjacent pair of said photoconductors and means for applying a reverse bias across at least one of said junctions.
Claim 3
Dependent Claim
33 words
A television camera tube as in claim 1 wherein both of said N-type photoconductors are formed of a material including cadmium sulphide and said P-type photoconductor is formed of a material including selenium.
Claim 4
Dependent Claim
34 words
A television camera tube as in claim 1 wherein both of said N-type photoconductors are formed of a material including cadmium sulphide and said P-type photoconductor is formed of a material including copper oxide.
Claim 5
Dependent Claim
34 words
A television camera tube as in claim 1 wherein both of said N-type photoconductors are formed of a material including cadmium sulphide and said P-type photoconductor is formed of a material including cupric oxide.
Claim 6
Dependent Claim
84 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said electron beam, said target electrode comprising a transparent conductor, said target electrode further comprising photoconductive materials including a phototransistor of P-type, N-type, and P-type materials in the order recited, and means for applying a reverse bias to at least one of the junctions of said phototransistor.
Claim 7
Dependent Claim
84 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said electron beam, said target electrode comprising a transparent conductor, said target electrode further comprising photoconductive materials including a phototransistor of P-type, N-type, and P-type materials in the order recited, and means for applying a reverse bias to at least one of the junctions of said phototransistor.
Claim 8
Dependent Claim
77 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said electron beam, said target electrode comprising a conductor and photoconductive materials including a phototransistor of N-P-N materials in the order recited, and means for applying a reverse bias to at least one of the junctions formed by said phototransistor.
Claim 9
Dependent Claim
77 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said electron beam, said target electrode comprising a conductor and photoconductive materials including a phototransistor of N-P-N materials in the order recited, and means for applying a reverse bias to at least one of the junctions formed by said phototransistor.
Claim 10
Dependent Claim
121 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said electron beam, said target electrode comprising a transparent conductive coating, a first P-type photoconductor on said transparent conductive coating, a N-type photoconductor on said first P-type photoconductor, a second P-type photoconductor on said N-type photoconductor and exposed to said electron beam, a first rectifying junction formed between said first P-type photoconductor and said N-type photoconductor, a second rectifying junction formed between said N-type photoconductor and said second P-type photoconductor, and means for forming a reverse bias across at least one of said junctions.
Claim 11
Dependent Claim
121 words
A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said electron beam, said target electrode comprising a transparent conductive coating, a first P-type photoconductor on said transparent conductive coating, a N-type photoconductor on said first P-type photoconductor, a second P-type photoconductor on said N-type photoconductor and exposed to said electron beam, a first rectifying junction formed between said first P-type photoconductor and said N-type photoconductor, a second rectifying junction formed between said N-type photoconductor and said second P-type photoconductor, and means for forming a reverse bias across at least one of said junctions.
Claim 12
Dependent Claim
33 words
A television camera tube as in claim 7 wherein both of said P-type photoconductors are formed of a material including selenium and said N-type photoconductor is formed of a material including cadmium sulphide.
Claim 13
Dependent Claim
79 words
A television camera tube comprising an envelope, an electron gun in said envelops for producing an electron beam, a target electrode in said envelope and in the path of said beam, said target electrode including a transparent conductive signal plate, a phototransistor having one surface on said signal plate and the other surface exposed to said beam, said phototransistor including at least two P-N junctions, and means for applying a reverse bias to at least one of said junctions.
Claim 14
Dependent Claim
79 words
A television camera tube comprising an envelope, an electron gun in said envelops for producing an electron beam, a target electrode in said envelope and in the path of said beam, said target electrode including a transparent conductive signal plate, a phototransistor having one surface on said signal plate and the other surface exposed to said beam, said phototransistor including at least two P-N junctions, and means for applying a reverse bias to at least one of said junctions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |