Patent US4448873A successfully refreshed from Google Patents.
US4448873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative working diazo contact film
Assignee: CNA Holdings LLC
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Filing: 1982-03-18
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Granted: 1984-05-15
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Expires: 2002-03-18
Abstract
Abstract A photographic element comprising a transparent support and a coating on the support comprising a diazonium composition having a light absorbency of about 45% or less, and a colorant composition, said coating having a light transmission of not more than about 0.1%.
Inventors
- 👤 John E. Walls
- 👤 Major S. Dhillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:19
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; G03F7/00; G03F7/004; G03F7/016; G03F7/0166
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
A photographic element capable of functioning as a photomask upon imagewise exposure to a suitable light source and upon development by a suitable developer, comprising a transparent support and a coating on at least a portion of said support, said coating comprising a light sensitive negative working diazonium composition having a light absorbency of about 45% or less when exposed to a suitable energy source in the range from about 350 to about 390 nanometers as determined by the herein specified Test Procedure, and a colorant composition comprising a mixture of dyes, said coating having a light transmission of not more than about 0.1% in the 350 to 390 nanometer range, and is capable of being rendered substantially insoluble upon exposure to ultraviolet radiation at an energy level of from about 15 to about 25 mJ/cm 2 and wherein the non-image areas are substantially removable upon treatment with a suitable developer.
Claim 2
Dependent Claim
151 words
A photographic element capable of functioning as a photomask upon imagewise exposure to a suitable light source and upon development by a suitable developer, comprising a transparent support and a coating on at least a portion of said support, said coating comprising a light sensitive negative working diazonium composition having a light absorbency of about 45% or less when exposed to a suitable energy source in the range from about 350 to about 390 nanometers as determined by the herein specified Test Procedure, and a colorant composition comprising a mixture of dyes, said coating having a light transmission of not more than about 0.1% in the 350 to 390 nanometer range, and is capable of being rendered substantially insoluble upon exposure to ultraviolet radiation at an energy level of from about 15 to about 25 mJ/cm 2 and wherein the non-image areas are substantially removable upon treatment with a suitable developer.
Claim 3
Dependent Claim
28 words
The element of claim 1 wherein said diazonium composition comprises the product of condensation of 4,4'-Bis-methoxymethyl diphenyl ether with 3-methoxy 4-diazo diphenylamine sulfate isolated as the mesitylene sulfonate.
Claim 4
Dependent Claim
32 words
The element of claim 1 wherein said diazonium composition comprises the reaction product of the homo-condensation product of 4,4'-Bis-methoxy methyl diphenyl ether with 3-methoxy-4-diazo diphenyl amine sulfate, isolated as the mesitylene sulfonate.
Claim 5
Dependent Claim
52 words
The element of claim 1 wherein said coating further comprises one or more binder resins selected from the group consisting of a copolymer of styrene and maleic anhydride, polymethylmethacrylate/methacrylic acid copolymer, copolymer of methyl vinyl ether and maleic anhydride, styrene and methacrylic acid copolymer, and poly methacrylic acid and acrylic acid copolymer.
Claim 6
Dependent Claim
43 words
The element of claim 1 wherein said coating further comprises one or more gums selected from the group consisting of hydroxy isopropyl cellulose, methyl cellulose, hydroxy ethyl cellulose, carboxy methyl hydroxy ethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone and copolymer of polyvinyl alcohol/polyvinyl acetate.
Claim 7
Dependent Claim
27 words
The element of claim 1 wherein said coating further comprises one or more plasticizers selected from the group consisting of dimethyl phthalate, dibutyl phthalate and dioctyl phthalate.
Claim 8
Dependent Claim
18 words
The element of claim 1 wherein said coating further comprises one or more organic sulfonic or disulfonic acids.
Claim 9
Dependent Claim
28 words
The element of claim 7 wherein said acid is selected from the group consisting of p-toluene sulfonic acid, benzene sulfonic acid, mesitylene sulfonic acid and naphthalene sulfonic acid.
Claim 10
Dependent Claim
27 words
The element of claim 1 wherein said coating comprises one or more additional ingredients selected from the group consisting of binder resins, gums, organic acids and plasticizers.
Claim 11
Dependent Claim
28 words
The element of claim 1 wherein said transparent support comprises a material selected from the group consisting of polyester, polystyrene, polyamide, polycarbonate, polypropylene, cellulose acetate films, and glass.
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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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |