US4374920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive developer containing non-ionic surfactants
Assignee: CNA Holdings LLC
•
Filing: 1981-07-27
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Granted: 1983-02-22
•
Expires: 2001-07-27
Abstract
Abstract A developer composition for positive working lithographic printing plates and photoresists comprising an aqueous alkaline solution with a non-ionic surfactant.
Inventors
- 👤 Stanley F. Wanat
- 👤 Shane Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:14
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32; G03F7/322
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A developer for positive working photographic elements which comprises an aqueous solution of hydroxide ions having a pH above about 7.0 provided from an alkali having a concentration in the developer which ranges from about 0.2 to about 10 percent by weight; and a compatible non-ionic surfactant selected from the group consisting of one or more of tetramethyl decynediol and ethoxylated tetramethyl decynediol.
Claim 2
Dependent Claim
63 words
A developer for positive working photographic elements which comprises an aqueous solution of hydroxide ions having a pH above about 7.0 provided from an alkali having a concentration in the developer which ranges from about 0.2 to about 10 percent by weight; and a compatible non-ionic surfactant selected from the group consisting of one or more of tetramethyl decynediol and ethoxylated tetramethyl decynediol.
Claim 3
Dependent Claim
38 words
The developer of claim 1 further comprising one or more compounds selected from the group consisting of the metal salts of hydrofluosilicic acid, hydrofluotitanic acid, hydrofluostannic acid, hydrofluoboric acid, orthosilicic acid, metasilicic acid, orthotitanic acid and stannic acid.
Claim 4
Dependent Claim
20 words
The developer of claim 2 wherein the concentration of alkali ranges from about 0.2 to about 10 percent by weight.
Claim 5
Dependent Claim
20 words
The developer of claim 3 wherein the concentration of surfactant ranges from about 0.1 to about 10 percent by weight.
Claim 6
Dependent Claim
20 words
The developer of claim 1 wherein the concentration of surfactant ranges from about 0.1 to about 10 percent by weight.
Claim 7
Dependent Claim
66 words
A developer for positive working photographic elements which comprises an aqueous solution of hydroxide ions having a pH above about 7.0 from an alkali selected from the group consisting of one or more of trisodium phosphate, sodium hydroxide, monosodium phosphate, sodium silicate, and sodium metasilicate; and a compatible non-ionic surfactant selected from the group consisting of one or more of tetramethyl decynediol and ethoxylated tetramethyl decynediol.
Claim 8
Dependent Claim
66 words
A developer for positive working photographic elements which comprises an aqueous solution of hydroxide ions having a pH above about 7.0 from an alkali selected from the group consisting of one or more of trisodium phosphate, sodium hydroxide, monosodium phosphate, sodium silicate, and sodium metasilicate; and a compatible non-ionic surfactant selected from the group consisting of one or more of tetramethyl decynediol and ethoxylated tetramethyl decynediol.
Claim 9
Dependent Claim
20 words
The developer of claim 6 wherein the concentration of surfactant ranges from about 0.1 to about 10 percent by weight.
Claim 10
Dependent Claim
38 words
The developer of claim 6 further comprising one or more compounds selected from the group consisting of the metal salts of hydrofluosilicic acid, hydrofluotitanic acid, hydrofluostannic acid, hydrofluoboric acid, orthosilicic acid, metasilicic acid, orthotitanic acid and stannic 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) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |