US3128181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet material coated with water-resistant polyvinyl alcohol and method of making the same
Assignee: Warren SD Co
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Filing: 1962-02-13
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Granted: 1964-04-07
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Expires: 1982-02-13
Abstract
No abstract record available.
Inventors
- 👤 Doggett Towers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:19
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212; G03F7/0215; C; C08; C08F; C08F8/00; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/60; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A PROCESS FOR PREPARING A LITHOGRAPHIC PRINTING PLATE COMPRISING APPLYING TO A FLEXIBLE BASE A THIN COATING OF AN AQUEOUS DISPERSION OF AN AT LEAST 98% HYDROLYZED POLYVINYL ALCOHOL CONTAINING FINELY-DIVIDED, MINERAL PIGMENT AND FREE FROM ANY ADDED CROSS-LINKING AGENT, DRYING SAID COATING, AND HEATING THE DRIED COATING TO A TEMPERATURE ABOVE 175*C. FOR A SUFFICIENT LENGTH OF TIME TO RENDER SAID THIN COATING WATER INSOLUBLE.
Claim 2
Dependent Claim
66 words
A PROCESS FOR PREPARING A LITHOGRAPHIC PRINTING PLATE COMPRISING APPLYING TO A FLEXIBLE BASE A THIN COATING OF AN AQUEOUS DISPERSION OF AN AT LEAST 98% HYDROLYZED POLYVINYL ALCOHOL CONTAINING FINELY-DIVIDED, MINERAL PIGMENT AND FREE FROM ANY ADDED CROSS-LINKING AGENT, DRYING SAID COATING, AND HEATING THE DRIED COATING TO A TEMPERATURE ABOVE 175*C. FOR A SUFFICIENT LENGTH OF TIME TO RENDER SAID THIN COATING WATER INSOLUBLE.
Claim 3
Dependent Claim
28 words
THE PROCESS OF CLAIM 1 WHEREIN SAID FLEXIBLE BASE IS A PAPER SHEET THAT HAS BEEN FIRST COATED WITH A BARRIER COATING OF A PIGMENTED WATERPROOF RESINOUS POLYMER.
Claim 4
Dependent Claim
22 words
THE PROCESS OF CLAIM 2 WHEREIN SAID LITHOGRAPHIC PRINTING PLATE IS RENDERED PHOTOSENSITIVE BY APPLYING A WASH COATING THERETO CONTAINING A SENSITZER.
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |