US3236646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying material for the photomechanical production of printing plates especially planographic and offset printing plates
Assignee: Azoplate Corp
•
Filing: 1962-01-22
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Granted: 1966-02-22
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Expires: 1982-01-22
Abstract
No abstract record available.
Inventors
- 👤 Steppan Hartmut
- 👤 Rebenstock August
- 👤 Neugebauer Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:08
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
A PROCESS FOR DEVELOPING A PRINTING PLATE WHICH COMPRISES EXPOSING A SUPPORTED LAYER TO LIGHT UNDER A MASTER AND TREATING THE EXPOSED LAYER WITH A DEVELOPER, THE LAYER COMPRISING AT LEAST ONE METAL SALT-FREE POLYFUNCTIONAL CONDENSATION PRODUCT OF A DIPHENYLAMINE-4-DIAZONIUM SALT WITH FORMALDEHYDE CONDENSED IN AN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROFLUORIC ACID, HYDROCHLORIC ACID, HYDROBROMIC ACID, SULFURIC ACID, AND TRIFLUOROACETIC ACID, AND ADDED EXCESS PHOSPHORIC ACID.
References Cited (Backward Citations)
US2266229A
Cited
US2679498A
Cited
GB698040A
Cited
US2739889A
Cited
US2937085A
Cited
US2923703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |