US3887371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic method for printing viewing-screen structure including treatment of exposed coating with ammonium compound
Assignee: RCA Licensing Corp
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Filing: 1973-12-10
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Granted: 1975-06-03
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Expires: 1993-12-10
Abstract
Abstract Method comprises (a) applying to a supporting surface for a viewing-screen structure of a cathode-ray tube a coating comprised of a dichromate-photosensitized organic binder, (b) exposing the coating of a pattern of actinic energy, including both heat energy and ultraviolet energy, (c) wetting the exposed coating with a dilute aqueous solution of an ammonium compound, such as ammonium oxalate, (d) and flushing the coating with an aqueous solvent to remove those portions of the coating that have been hardened solely by heat energy, while retaining portions of the coating that have been hardened by ultraviolet energy.
Inventors
- 👤 Ratib Sofar Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:50
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
A PHOTOGRAPHIC METHOD FOR PRINTING A VIEWING-SCREEN STRUCTURE UPON A SUPPORTING SURFACE COMPRISING: A. APPLYING TO SAID SUPPORTING SURFACE A COATING COMPRISED OF A DICHROMATIZABLE ORGANIC BINDER AND A DICHROMATE B. EXPOSING SAID COATING TO A PATTERN OF ACTINIC ENERGY, SAID EXPOSURE INCLUDING BOTH HEAT ENERGY AND ULTRAVIOLET ENERGY, C. WETTING SAID EXPOSED COATING WITH A DILUTE AQUEOUS SOLUTION OF AN AMMONIUM COMPOUND, D. AND THEN FLUSHING SAID EXPOSED COATING WITH AN AQUEOUS TION OF AN AMMONIUM COMPOUND, D. AND THEN FLUSHING SAID EXPOSED COATING WITH AN AQUEOUS SOLVENT TO REMOVE THE MORE-SOLUBLE PORTIONS OF THE COATING AND THOSE LESS-SOLUBLE PORTIONS OF SAID COATING THAT IN PLACE THE LESS-SOLUBLE PORTIONS OF SAID COATING THAT HAVE BEEN EXPOSED TO ULTRAVIOLET ENERGY.
Claim 2
Dependent Claim
120 words
A PHOTOGRAPHIC METHOD FOR PRINTING A VIEWING-SCREEN STRUCTURE UPON A SUPPORTING SURFACE COMPRISING: A. APPLYING TO SAID SUPPORTING SURFACE A COATING COMPRISED OF A DICHROMATIZABLE ORGANIC BINDER AND A DICHROMATE B. EXPOSING SAID COATING TO A PATTERN OF ACTINIC ENERGY, SAID EXPOSURE INCLUDING BOTH HEAT ENERGY AND ULTRAVIOLET ENERGY, C. WETTING SAID EXPOSED COATING WITH A DILUTE AQUEOUS SOLUTION OF AN AMMONIUM COMPOUND, D. AND THEN FLUSHING SAID EXPOSED COATING WITH AN AQUEOUS TION OF AN AMMONIUM COMPOUND, D. AND THEN FLUSHING SAID EXPOSED COATING WITH AN AQUEOUS SOLVENT TO REMOVE THE MORE-SOLUBLE PORTIONS OF THE COATING AND THOSE LESS-SOLUBLE PORTIONS OF SAID COATING THAT IN PLACE THE LESS-SOLUBLE PORTIONS OF SAID COATING THAT HAVE BEEN EXPOSED TO ULTRAVIOLET ENERGY.
Claim 3
Dependent Claim
118 words
A photographic method for printing a viewing-screen structure upon a supporting surface comprising: a. applying to said supporting surface a coating comprised of a dichromatizable organic binder and a dichromate photosensitizer for said binder, b. exposing said coating to a pattern of actinic energy, said exposure including both heat energy and ultraviolet energy, c. wetting said exposed coating with a dilute aqueous solution of an ammonium compound, d. and then flushing Said exposed coating with an aqueous solvent to remove the more-soluble portions of the coating and those less-soluble portions of said coating that have been exposed solely to heat energy, while retaining in place the less-soluble portions of said coating that have been exposed to ultraviolet energy.
Claim 4
Dependent Claim
118 words
A photographic method for printing a viewing-screen structure upon a supporting surface comprising: a. applying to said supporting surface a coating comprised of a dichromatizable organic binder and a dichromate photosensitizer for said binder, b. exposing said coating to a pattern of actinic energy, said exposure including both heat energy and ultraviolet energy, c. wetting said exposed coating with a dilute aqueous solution of an ammonium compound, d. and then flushing Said exposed coating with an aqueous solvent to remove the more-soluble portions of the coating and those less-soluble portions of said coating that have been exposed solely to heat energy, while retaining in place the less-soluble portions of said coating that have been exposed to ultraviolet energy.
Claim 5
Dependent Claim
43 words
The method defined in claim 1 wherein said solution is a 0.01 to 2.0 weight-percent solution of an ammonium compound selected from the group consisting of ammonium hydroxide, ammonium oxalate, ammonium formate, ammonium citrate, ammonium acetate, ammonium chloride, ammonium nitrate and ammonium carbonate.
Claim 6
Dependent Claim
15 words
The method defined in claim 1 wherein said dichromatizable organic binder is a polyvinyl alcohol.
Claim 7
Dependent Claim
17 words
The method defined in claim 3 wherein said ammonium compound is a salt of an organic acid.
Claim 8
Dependent Claim
17 words
The method defined in claim 3 wherein said ammonium compound is a salt of an inorganic acid.
Claim 9
Independent Claim
138 words
A method for printing a phosphor-viewing-screen structure for a cathode-ray tube upon a supporting surface comprising: a. applying to said supporting surface a coating comprised of polyvinyl alcohol, a dichromate photosensitizer for said alcohol, and particles of phosphor for said screen structure, b. projecting a pattern of actinic energy upon said coating, said exposure including both heat energy and ultraviolet energy, thereby reducing the solubility of the exposed portions of said coating, c. wetting said exposed coating with a dilute aqueous solution of an ammonium compound, d. and then flushing said wet coating with an aqueous solvent to remove the unexposed more-soluble portions of said coating and the less-soluble portions of said coating that have been exposed solely to heat energy while retaining in place the less-soluble portions of said coating that have been exposed to ultraviolet energy.
Claim 10
Independent Claim
138 words
A method for printing a phosphor-viewing-screen structure for a cathode-ray tube upon a supporting surface comprising: a. applying to said supporting surface a coating comprised of polyvinyl alcohol, a dichromate photosensitizer for said alcohol, and particles of phosphor for said screen structure, b. projecting a pattern of actinic energy upon said coating, said exposure including both heat energy and ultraviolet energy, thereby reducing the solubility of the exposed portions of said coating, c. wetting said exposed coating with a dilute aqueous solution of an ammonium compound, d. and then flushing said wet coating with an aqueous solvent to remove the unexposed more-soluble portions of said coating and the less-soluble portions of said coating that have been exposed solely to heat energy while retaining in place the less-soluble portions of said coating that have been exposed to ultraviolet energy.
Claim 11
Dependent Claim
32 words
The method defined in claim 6 wherein said ammonium compound is the salt of an inorganic acid and is present in concentrations of 0.01 to 2.0 weight percent of said aqueous solution.
Claim 12
Dependent Claim
32 words
The method defined in claim 6 wherein said ammonium compound is the salt of an organic acid and is present in concentrations of 0.01 to 2.0 weight percent of said aqueous solution.
Claim 13
Dependent Claim
24 words
The method defined in claim 6 wherein said ammonium compound is present in said solution in concentrations of about 0.1 to 0.5 weight percent.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |