US3713830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Presensitized lithographic printing plate and process for preparing same
Assignee: EIDP Inc
•
Filing: 1970-12-24
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Granted: 1973-01-30
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Expires: 1990-12-24
Abstract
Abstract A PRESENSITISED PRINTING PLATE COMPRISES A SUPPORT SHEET OF ALUMINIUM OR ALUMINIUM ALLOY HAVING A SURFACE WHICH HAS BEEN ANODISED USING AQUEOUS PHOSPHORIC ACID AS ELECTROLYTE. A LAYER OF LIGHT SENSITIVE MATERIAL COMPRISING A MIXTURE OF A NOVOLAK RESIN AND A DIAZO SALT IS APPLIED TO THE ANODISED SURFACE. THE DIAZO SALT MAY BE USED IN THE FORM OF A STABLE DOUBLE SALT OR A STABLE COMPLEX. THE PRESENSITISED PRINTING PLATE IS STORAGE STABLE FOR LONG PERIODS AND, ON PROCESSING GIVES RISE TO A LITHOGRAPHIC PRINTING PLATE CAPABLE OF PRODUCING MANY COPIES.
Inventors
- 👤 L Watkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:00
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |