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Patent US3250644A successfully refreshed from Google Patents.
US3250644A
Expired / Lapsed
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Method for removing images from presensitized lithographing plates
Assignee: Polychrome Corp
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Filing: 1963-03-27
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Granted: 1966-05-10
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Expires: 1983-03-27
Abstract
No abstract record available.
Inventors
- 👤 Marcus Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:02
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD FOR REMOVING AN EXPOSED AND DEVELOPED DIAZO RESIN IMAGE FROM A LITHOGRAPHIC PLATE CONSTITUTED OF A METALLIC SUBSTRATE HAVING AN ALKALI METAL SILICATE UNDERCOATING THEREON, WHICH COMPRISES CONTACTING SAID PLATE WITH A SOLUTION CONSISTING ESSENTIALLY OF 85 TO 97% ACETONE AND 3 TO 15% HYDROFLUORIC ACID, AND THEN WIPING THE DIAZO RESIN IMAGE FROM THE PLATE WITH AN ABSORBENT MATERIAL.
Claim 2
Independent Claim
62 words
A METHOD FOR REMOVING AN EXPOSED AND DEVELOPED DIAZO RESIN IMAGE FROM A LITHOGRAPHIC PLATE CONSTITUTED OF A METALLIC SUBSTRATE HAVING AN ALKALI METAL SILICATE UNDERCOATING THEREON, WHICH COMPRISES CONTACTING SAID PLATE WITH A SOLUTION CONSISTING ESSENTIALLY OF 85 TO 97% ACETONE AND 3 TO 15% HYDROFLUORIC ACID, AND THEN WIPING THE DIAZO RESIN IMAGE FROM THE PLATE WITH AN ABSORBENT MATERIAL.
References Cited (Backward Citations)
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Cited
US2507314A
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US2558013A
Cited
US2732796A
Cited
US3046114A
Cited
US2994609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |