US4049452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse-printing method for producing cathode-ray-tube-screen structure
Assignee: RCA Licensing Corp
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Filing: 1975-04-23
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Granted: 1977-09-20
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Expires: 1995-04-23
Abstract
Abstract In the method disclosed, a supporting surface, such as the inner surface of the faceplate of the tube, is coated with a photosensitive polymeric film containing about 5 to 80 weight percent of at least one member of the group consisting of certain diol ethers and diol alkanes. Then the film is exposed to a light image to produce regions of greater solubility and regions of lesser solubility. The film regions of greater solubility are removed, and then the entire faceplate with its regions of less solubility is overcoated with a layer containing particles of screen structure material. The retained film regions and the overcoating thereon are removed leaving the screen structure adherent in the areas of greater solubility. By including a diol ether or diol alkane in the film, the exposure time may be shortened significantly without substantial loss of adherence.
Inventors
- 👤 Edith Mayaud Nekut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:53
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2278; G; G03; G03F; G03F7/00; G03F7/004; G03F7/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
224 words
A method for preparing a luminescent-screen structure of a cathode-ray tube, the steps comprising, a. coating a support surface with a film of a polymeric material whose solubility is altered when it is exposed to radiant energy, said film containing about 5 to 80 weight percent of at least one member of the group consisting of diol alkanes having the molecular formula HO--CH.sub.2 --(CH.sub.2).sub.m --CH.sub.2 --OH where m is an integer in the range of 2 to 5 and diol ethers having the molecular formula HO--CH.sub.2 --(CH.sub.2 --O--CH.sub.2).sub.n --CH.sub.2 --OH where n is an integer in the range of 1 to 5, b. exposing said film to an image in the form of radiant energy until the solubility of the irradiated regions thereof is selectively altered, thereby producing in said film regions of greater solublity and regions of lesser solubility, c. removing those regions of said film with greater solubility thereby baring the areas of the support surface underlying said regions of greater solubility, while retaining those regions of said film of lesser solubility, d. coating said bare areas of said support surface and said retained film regions with a composition containing particles of screen-structure material, e. and then removing at least a portion of said retained film regions and the overcoating composition thereon, while retaining the overcoating composition coated on said support surface.
Claim 2
Independent Claim
224 words
A method for preparing a luminescent-screen structure of a cathode-ray tube, the steps comprising, a. coating a support surface with a film of a polymeric material whose solubility is altered when it is exposed to radiant energy, said film containing about 5 to 80 weight percent of at least one member of the group consisting of diol alkanes having the molecular formula HO--CH.sub.2 --(CH.sub.2).sub.m --CH.sub.2 --OH where m is an integer in the range of 2 to 5 and diol ethers having the molecular formula HO--CH.sub.2 --(CH.sub.2 --O--CH.sub.2).sub.n --CH.sub.2 --OH where n is an integer in the range of 1 to 5, b. exposing said film to an image in the form of radiant energy until the solubility of the irradiated regions thereof is selectively altered, thereby producing in said film regions of greater solublity and regions of lesser solubility, c. removing those regions of said film with greater solubility thereby baring the areas of the support surface underlying said regions of greater solubility, while retaining those regions of said film of lesser solubility, d. coating said bare areas of said support surface and said retained film regions with a composition containing particles of screen-structure material, e. and then removing at least a portion of said retained film regions and the overcoating composition thereon, while retaining the overcoating composition coated on said support surface.
Claim 3
Dependent Claim
22 words
The method defined in claim 1 wherein said film contains about 20 to 50 weight percent of said at least one member.
Claim 4
Dependent Claim
21 words
The method defined in claim 1 wherein said film contains about 20 to 50 weight percent of 2.2' ethylene dioxy diethanol.
Claim 5
Independent Claim
223 words
A method for preparing a luminescent-screen structure of a cathode-ray tube, the steps comprising, a. coating a supporting surface with a film of polyvinyl alcohol, a dichromate sensitizer therefor and about 5 to 80 weight percent with respect to the weight of polyvinyl alcohol present of at least one member of the group consisting of diol alkanes having the molecular formula HO--CH.sub.2 --(CH.sub.2).sub.m --CH.sub.2 --OH where m is an integer in the range of 2 to 5 and diol ethers having the molecular formula HO--CH.sub.2 --(CH.sub.2 --O--CH.sub.2).sub.n --CH.sub.2 --OH where n is an integer in the range of 1 to 5, b. exposing said film to an image in the form of radiant energy until the solubility of the irradiated regions thereof is selectively altered, thereby producing in said film regions of greater solubility and regions of lesser solubility, c. removing those regions of said film with greater solubility thereby baring the areas of the support surface underlying said regions of greater solubility, while retaining those regions of said film of lesser solubility, d. coating said bare areas of said support surface and said retained film regions with a composition containing particles of screen-structure material, e. and then removing at least a portion of said retained film regions and the overcoating composition thereon, while retaining the overcoating composition coated on said support surface.
Claim 6
Independent Claim
223 words
A method for preparing a luminescent-screen structure of a cathode-ray tube, the steps comprising, a. coating a supporting surface with a film of polyvinyl alcohol, a dichromate sensitizer therefor and about 5 to 80 weight percent with respect to the weight of polyvinyl alcohol present of at least one member of the group consisting of diol alkanes having the molecular formula HO--CH.sub.2 --(CH.sub.2).sub.m --CH.sub.2 --OH where m is an integer in the range of 2 to 5 and diol ethers having the molecular formula HO--CH.sub.2 --(CH.sub.2 --O--CH.sub.2).sub.n --CH.sub.2 --OH where n is an integer in the range of 1 to 5, b. exposing said film to an image in the form of radiant energy until the solubility of the irradiated regions thereof is selectively altered, thereby producing in said film regions of greater solubility and regions of lesser solubility, c. removing those regions of said film with greater solubility thereby baring the areas of the support surface underlying said regions of greater solubility, while retaining those regions of said film of lesser solubility, d. coating said bare areas of said support surface and said retained film regions with a composition containing particles of screen-structure material, e. and then removing at least a portion of said retained film regions and the overcoating composition thereon, while retaining the overcoating composition coated on said support surface.
Claim 7
Dependent Claim
22 words
The method defined in claim 4 wherein said film contains about 20 to 50 weight percent of said at least one member.
Claim 8
Dependent Claim
21 words
The method defined in claim 5 wherein said film contains about 20 to 50 weight percent of 2.2' ethylene dioxy diethanol.
Claim 9
Dependent Claim
20 words
The method defined in claim 5 wherein said film contains about 20 to 50 weight percent of 1,5 pentane diol.
Claim 10
Dependent Claim
19 words
The method defined in claim 5 wherein said film contains about 20 to 50 weight percent of tetraethylene glycol.
Claim 11
Dependent Claim
24 words
The method defined in claim 5 wherein said film contains about 20 to 50 weight percent of a diol ether polymer of ethylene oxide.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |