Patent US2741981A successfully refreshed from Google Patents.
US2741981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planographic printing plate and treatment thereof
Assignee: Warren SD Co
•
Filing: 1951-11-19
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Granted: 1956-04-17
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Expires: 1971-11-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:13
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/038; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
PROCESS FOR IMPROVING A PLANOGRAPHIC PRINTING SURFACE ON A PAPER BASE, SAID SURFACE COMPRISING A REDUCING ORGANIC MATERIAL, WHICH COMPRISES UNIFORMLY WETTING SAID SURFACE WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE PERMANGANATE, SAID SOLUTION BEING SUBSTANTIALLY FREE OF NONVOLATILE ORGANIC FILM-FORMING MATERIAL, AND DRYING SAID SURFACE.
Claim 2
Dependent Claim
46 words
PROCESS FOR IMPROVING A PLANOGRAPHIC PRINTING SURFACE ON A PAPER BASE, SAID SURFACE COMPRISING A REDUCING ORGANIC MATERIAL, WHICH COMPRISES UNIFORMLY WETTING SAID SURFACE WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE PERMANGANATE, SAID SOLUTION BEING SUBSTANTIALLY FREE OF NONVOLATILE ORGANIC FILM-FORMING MATERIAL, AND DRYING SAID SURFACE.
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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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |