Patent US5214093A successfully refreshed from Google Patents.
US3136639A
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Diazo presensitized lithographic plate base comprising a urea-formaldehyde intermediate layer and process for making
Assignee: Lithoplate Inc
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Filing: 1961-12-04
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Granted: 1964-06-09
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Expires: 1981-12-04
Abstract
No abstract record available.
Inventors
- 👤 Elmer F Deal
- 👤 Isadore M Richlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:43
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/11; B; B41; B41N; B41N3/00; B41N3/03; B41N3/036; G03F7/016; G03F7/021; B41C; B41C1/00; B41C1/10; B41C1/1008; B41C1/1016; B41C2201/00; B41C2201/04; B41C2210/00; B41C2210/04; B41C2210/24; B41C2210/26; B41C2210/266
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
IN A LITHOGRAPHIC PLATE HAVING A SUPPORT MEMBER WITH A METAL SURFACE AN OVERLYING LAYER ON SAID METAL SURFACE OF A DIAZO COMPOUND REACTIVE TO LIGHT TO DEFINE PRINTING AND NON-PRINTING AREAS AND AN INTERMEDIATE COAT BETWEEN SAID SUPPORT MEMBER AND DIAZO, THE IMPROVEMENT WHEREIN SAID INTERMEDIATE COAT IS A RESIN CONSISTING ESSENTIALLY OF A WATER-SOLUBLE MODIFIED UREA-FORMALDEHYDE RESIN CONDENSATION PRODUCT POLYMERIZED TO A WATER-INSOLUBLE HYDROPHILIC STATE SELECTED FROM THE GROUP CONSISTING OF (A) A SULFONATED UREA-FORMALDEHYDE AND (B) A CONDENSATIN PRODUCT OF UREA, FORMALDEHYDE AND AN AMINE SELECTED FROM THE GROUP CONSISTING OF ALKYLENE POLYAMINES, THE CONDENSATION PRODUCTS OF TETRAETHYLENE PENTAMINE AND EPICHLOROHYDRIN, THE CONDENSATION PRODUCTS OF TETRAETHYLENE PENTAMINE AND FORMALDEHYDE, GUANIDINE, BIGUANIDE, AND ALKANOLAMINES.
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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 |