US4366224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic lithium developer composition
Assignee: CNA Holdings LLC
•
Filing: 1981-08-06
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Granted: 1982-12-28
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Expires: 2001-08-06
Abstract
Abstract A developer composition for positive photosensitive lithographic printing plates and photoresists comprising an aqueous solution of an inorganic lithium compound and sodium metasilicate.
Inventors
- 👤 Shane Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:11
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32; G03F7/322
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
28 words
A method for developing positive working photographic elements by treating an exposed photographic element with a developer composition consisting essentially of an inorganic lithium composition and sodium metasilicate.
Claim 2
Independent Claim
28 words
A method for developing positive working photographic elements by treating an exposed photographic element with a developer composition consisting essentially of an inorganic lithium composition and sodium metasilicate.
Claim 3
Dependent Claim
29 words
The method of claim 1 which said inorganic lithium composition contains one or more compounds selected from the group consisting of lithium hydroxide, chloride, bromide, nitrate carbonate and sulfate.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the sodium metasilicate is present in an amount of up to about 30 percent by weight.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein the sodium metasilicate is present in an amount of from about 1 to about 20 percent by weight.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the sodium metasilicate is present in an amount of from about 3 to about 10 percent by weight.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein the inorganic lithium composition is present in an amount of from about 0.1 to about 10 percent by weight.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein the inorganic lithium composition is present in an amount of from about 0.1 to about 3 percent by weight.
Claim 9
Dependent Claim
25 words
The method of claim 1 wherein the inorganic lithium composition is present in an amount of from about 0.2 to about 1 percent by weight.
Claim 10
Dependent Claim
43 words
The method of claim 1 or 2 wherein said lithium composition is present in an amount of from about 0.1 to about 10 percent by weight and the sodium metasilicate is present in an amount of up to about 30 percent by weight.
Claim 11
Dependent Claim
28 words
The method of claim 1 wherein said developer composition further comprises one or more compositions selected from the group consisting of solvents, wetting agents, surfactants and metal cleaners.
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |