US2882153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planographic printing plate
Assignee: Polychrome Corp
•
Filing: 1954-02-04
•
Granted: 1959-04-14
•
Expires: 1974-02-04
Abstract
No abstract record available.
Inventors
- 👤 Cohn Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:02
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/038
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
THE METHOD OF PREPARING A PRE-SENSITIVE ALUMINUM BASE PLANOGRAPHIC PRINTING PLATE WHICH COMPRISES ETCHING THE ALUMINUM SURFACE WITH AN ACID FROM THE GROUP CONSISTING OF PHOSPHORIC AND SULFURIC ACIDS, COATING THE ETCHED SURFACE WHEN A SILICEOUS LAYER BY TREATMENT WITH AN ALKALI SILICATE SOLUTION, AND HARDENING SAID SILICEOUS LAYER BY TREATMENT WITH AN AQUEOUS SOLUTION CONTAINING AT LEAST 3 PERCENT, BY WEIGHT, OF AN ALKALINE EARTH SALT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |