Patent US4100096A successfully refreshed from Google Patents.
US4100096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaner for hydrophilic metal surfaces of lithographic duplicators
Assignee: AB Dick Co
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Filing: 1976-06-04
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Granted: 1978-07-11
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Expires: 1996-06-04
Abstract
Abstract Hydrophilic surfaces on lithographic duplicators are cleaned by light rubbing with a liquid composition comprising levigated alumina of small particle size, a surfactant, an aluminum salt and an acidifying agent all dispersed in water. The surface is then rinsed with water to remove the cleaning composition, and is found to be in an ink-free moisture receptive condition.
Inventors
- 👤 Jack C. Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:14
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/06; B41F; B41F35/00; B41L; B41L41/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
The process of cleaning lithographic ink deposits from metal surfaces of a lithographic duplicator which comprises rubbing the surface to be cleaned with a composition consisting essentially of an aqueous dispersion containing about 6 percent to 25 percent by weight of levigated alumina of particle size smaller than 25 microns, about 0.02 percent to 0.25 percent by weight of a water miscible, acid stable, non-cationic surfactant, about 8 percent to 15 percent by weight of aluminum sulfate and an acid present in an amount sufficient to maintain the pH of the dispersion in the range of 0.65 to 0.75, and thereafter removing from the cleaned surface any residue of said composition.
Claim 2
Dependent Claim
111 words
The process of cleaning lithographic ink deposits from metal surfaces of a lithographic duplicator which comprises rubbing the surface to be cleaned with a composition consisting essentially of an aqueous dispersion containing about 6 percent to 25 percent by weight of levigated alumina of particle size smaller than 25 microns, about 0.02 percent to 0.25 percent by weight of a water miscible, acid stable, non-cationic surfactant, about 8 percent to 15 percent by weight of aluminum sulfate and an acid present in an amount sufficient to maintain the pH of the dispersion in the range of 0.65 to 0.75, and thereafter removing from the cleaned surface any residue of said composition.
Claim 3
Dependent Claim
31 words
A process as set forth in claim 1 in which the levigated alumina includes only particles smaller than 15 microns, of which no more than half are smaller than 5 microns.
Claim 4
Dependent Claim
85 words
A composition for cleaning the hydrophilic metal surfaces of lithographic duplicators consisting essentially of an aqueous dispersion containing about 6 percent to 25 percent by weight of levigated alumina of particle size smaller than 25 microns, about 0.02 percent to 0.25 percent by weight of a water miscible, acid stable, non-cationic surfactant, about 5 percent to 15 percent by weight of aluminum sulfate and an acid present in an amount sufficient to maintain the pH of the dispersion in the range of 0.65 to 0.75.
Claim 5
Dependent Claim
85 words
A composition for cleaning the hydrophilic metal surfaces of lithographic duplicators consisting essentially of an aqueous dispersion containing about 6 percent to 25 percent by weight of levigated alumina of particle size smaller than 25 microns, about 0.02 percent to 0.25 percent by weight of a water miscible, acid stable, non-cationic surfactant, about 5 percent to 15 percent by weight of aluminum sulfate and an acid present in an amount sufficient to maintain the pH of the dispersion in the range of 0.65 to 0.75.
Claim 6
Dependent Claim
28 words
A composition according to claim 3 wherein the levigated alumina includes only particles smaller than 15 microns, of which no more than half are smaller than 5 microns.
Claim 7
Dependent Claim
39 words
A composition according to claim 4 wherein the levigated alumina is present in about 16.25 percent by weight of the composition, the surfactant about 0.05 percent, the aluminum sulfate about 11.6 percent and concentrated nitric acid about 3.25 percent.
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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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |