Patent US2930316A successfully refreshed from Google Patents.
US3136636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planographic printing plate comprising a polyacid organic intermediate layer
Assignee: 3M Co
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Filing: 1955-07-25
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Granted: 1964-06-09
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Expires: 1975-07-25
Abstract
No abstract record available.
Inventors
- 👤 John F Dowdall
- 👤 John M Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:23
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/038; G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PRESENSITIZED, DIMENSIONALLY STABLE PLATE SUITABLE FOR LITHOGRAHIC PRINTING AND RELATED USES, AND CAPABLE OF BEING SHIPPED IN LIGHT-PROOF PACKAGES, STORED AND THEN USED WEEKS OR MONTHS AFTER MANUFACTURE, COMPRISING A THIN SHEET OF METAL HAVING ON AT LEAST ONE SURFACE THEREOF A FIRMLY BONDED EXTREMELY THIN WATER-INSOLUBLE PROTECTIVE IMAGE-RETAINING LAYER FORMED BY TREATING SAID METAL SURFACE WITH A SOLUTION OF A WATER-SOLUBLE POLYACID ORGANIC POLYMER CAPABLE OF BEING FORMED INTO A SELF-SUSTAINING FILM AND CONTAINING REPEATING ACID UNITS, SAID LAYER BEING THE RESULT OF INTERACTION BETWEEN SAID METAL SHEET AND SAID ORGANIC POLYMER AND BEING SUBSTANTIALLY FREE OF WATER-SOLUBLE EXCESS OF SAID POLYMER, AND COATED OVER AND DIRECTLY IN CONTACT WITH SAID LAYER A THIN COATING OF A WATER-SOLUBLE LIGHT-SENSITIVE DIAZO RESIN SENSITIZER.
Claim 2
Dependent Claim
124 words
A PRESENSITIZED, DIMENSIONALLY STABLE PLATE SUITABLE FOR LITHOGRAHIC PRINTING AND RELATED USES, AND CAPABLE OF BEING SHIPPED IN LIGHT-PROOF PACKAGES, STORED AND THEN USED WEEKS OR MONTHS AFTER MANUFACTURE, COMPRISING A THIN SHEET OF METAL HAVING ON AT LEAST ONE SURFACE THEREOF A FIRMLY BONDED EXTREMELY THIN WATER-INSOLUBLE PROTECTIVE IMAGE-RETAINING LAYER FORMED BY TREATING SAID METAL SURFACE WITH A SOLUTION OF A WATER-SOLUBLE POLYACID ORGANIC POLYMER CAPABLE OF BEING FORMED INTO A SELF-SUSTAINING FILM AND CONTAINING REPEATING ACID UNITS, SAID LAYER BEING THE RESULT OF INTERACTION BETWEEN SAID METAL SHEET AND SAID ORGANIC POLYMER AND BEING SUBSTANTIALLY FREE OF WATER-SOLUBLE EXCESS OF SAID POLYMER, AND COATED OVER AND DIRECTLY IN CONTACT WITH SAID LAYER A THIN COATING OF A WATER-SOLUBLE LIGHT-SENSITIVE DIAZO RESIN SENSITIZER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |