Patent US4308340A successfully refreshed from Google Patents.
US4308340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous 2-propoxyethanol containing processing composition for lithographic printing plates
Assignee: CNA Holdings LLC
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Filing: 1980-08-08
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Granted: 1981-12-29
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Expires: 2000-08-08
Abstract
Abstract A developer suitable for machine and hand processing may now be made which accomplishes the aforementioned objects which is an aqueous solution comprising 2-propoxyethanol as a detackifying agent, an adjuvant solvent, a nonionic surfactant with a hydrophile-lipophile balance over about 17, and an inorganic salt. A developer/finisher may be prepared by adding thereto a water-soluble polymeric film former which is preferably polyvinyl pyrrolidone. A suspending agent, e.g. polyethylene glycol, is added to hand processing solutions.
Inventors
- 👤 John E. Walls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:01
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
33 words
An aqueous developer for lithographic printing plates comprising in admixture (a) 2-propoxyethanol as a detackifying agent; (b) a nonionic surfactant having a hydrophile-lipophile balance greater than about 17; and (c) an inorganic salt.
Claim 2
Dependent Claim
33 words
An aqueous developer for lithographic printing plates comprising in admixture (a) 2-propoxyethanol as a detackifying agent; (b) a nonionic surfactant having a hydrophile-lipophile balance greater than about 17; and (c) an inorganic salt.
Claim 3
Dependent Claim
14 words
The developer as defined in claim 1, which further comprises an adjuvant organic solvent.
Claim 4
Dependent Claim
23 words
The developer as defined in claim 2, wherein the adjuvant organic solvent has a vapor pressure greater than about 1 mm of mercury.
Claim 5
Dependent Claim
25 words
The developer as defined in claim 3, wherein the adjuvant organic solvent is selected from the class consisting of n-propanol, isopropanol, and propoxy isopropyl ether.
Claim 6
Dependent Claim
22 words
The developer as defined in claim 3, which further comprises a polyethylene glycol having an average molecular weight not exceeding about 800.
Claim 7
Dependent Claim
40 words
An aqueous developer/finisher for lithographic printing plates comprising in admixture (a) 2-propoxyethanol as a detackifying agent; (b) a nonionic surfactant having a hydrophile-lipophile balance greater than about 17; (c) an inorganic salt; and (d) a water soluble polymeric film former.
Claim 8
Dependent Claim
40 words
An aqueous developer/finisher for lithographic printing plates comprising in admixture (a) 2-propoxyethanol as a detackifying agent; (b) a nonionic surfactant having a hydrophile-lipophile balance greater than about 17; (c) an inorganic salt; and (d) a water soluble polymeric film former.
Claim 9
Dependent Claim
12 words
The developer/finisher as defined in claim 6, further comprises adjuvant organic solvent.
Claim 10
Dependent Claim
23 words
The developer/finisher as defined in claim 7, wherein the adjuvant organic solvent has a vapor pressure greater than about 1 mm of mercury.
Claim 11
Dependent Claim
24 words
The developer/finisher as defined in claim 7, wherein the adjuvant solvent is selected from the class consisting of n-propanol, isopropoanol and propoxy isopropyl ether.
Claim 12
Dependent Claim
28 words
The developer/finisher as defined in claim 6, wherein said water soluble polymeric film former is a polyvinyl pyrrolidone having a molecular weight between about 5,000 and about 100,000.
Claim 13
Dependent Claim
24 words
The developer/finisher as defined in claim 6 suited for hand developing, further comprising polyethylene glycol having an average molecular weight not exceeding about 800.
References Cited (Backward Citations)
US3745028A
Cited
US4186006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |