US3637384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive-working diazo-oxide terpolymer photoresists
Assignee: Shipley Co Inc
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Filing: 1969-02-17
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Granted: 1972-01-25
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Expires: 1989-02-17
Abstract
Abstract A novel positive-working photoresist composition comprising a diazo-oxide such as N-dehydroabietyl-6-diazo-5(6H)-oxo-1naphthalene-sulfonamide, a resin such as a terpolymer which contains carboxy groups, and a solvent therefor.
Inventors
- 👤 Albert S Deutsch
- 👤 Frank J Loprest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/023; G03F7/0233
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A positive-working photoresist composition comprising N-dehydroabietyl-6-diazo-5-(6H)-oxo-1-naphthalene-sulfonamide; a terpolymer wherein one of the monomers of the terpolymer is selected from the group consisting of methyl acrylate, ethyl acrylate, and propyl acrylate, wherein a second monomer of the terpolymer is selected from the group consisting of p-methyl styrene, p-chloro styrene, p-ethyl styrene and styrene, and a third monomer of the terpolymer is selected from the group consisting of acrylic acid, methacrylic acid and maleic acid, wherein the third monomer is present to the extent that the carboxylic acid group of the third monomer weighs from about 3-15 percent of the total weight of the three monomers; and a solvent therefor.
Claim 2
Dependent Claim
20 words
A positive-working photoresist composition of claim 2 comprising a terpolymer composed of the monomers methyl acrylate, styrene and acrylic acid.
Claim 3
Dependent Claim
115 words
A presensitized printing plate comprising a base material having coated thereon a positive-working photoresist composition comprising N-dehydroabietyl-6-diazo-5(6H)-oxo-1-naphthalene-sulfonamide; a terpolymer wherein one of the monomers of the terpolymer is selected from the group consisting of methyl acrylate, ethyl acrylate, and propyl acrylate, wherein a second monomer of the terpolymer is selected from the group consisting of p-methyl styrene, p-chloro styrene, p-ethyl styrene and styrene, and a third monomer of the terpolymer is selected from the group consisting of acrylic acid, methacrylic acid and maleic acid, wherein the third monomer is present to the extent that the carboxylic acid group of the third monomer weighs from about 3-15 percent of the total weight of the three monomers.
Claim 4
Dependent Claim
25 words
The positive-working photoresist composition of claim 2 wherein the terpolymer comprises about 57.5 percent ethyl acrylate, 32.6 percent styrene and about 9.9 percent acrylic acid.
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |