US3250644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing images from presensitized lithographing plates
Assignee: Polychrome Corp
•
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 04:00
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)
US716977A
Cited
US2507314A
Cited
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 |