Patent US3660581A successfully refreshed from Google Patents.
US3660581A
Expired / Lapsed
US
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Thermally developable diazotype printing paper and composition therefor
Assignee: SCM Corp
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Filing: 1969-04-23
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Granted: 1972-05-02
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Expires: 1989-04-23
Abstract
Abstract DIAZO COMPOSITIONS CONTAINING CRITICAL PROPORTIONS OF DICYANDIAMIDE AND THIOUREA AS THE THERMAL DEVELOPING AGENTS TOGETHER WITH ALKALI ACID SULFATE STABILIZER COMPOUNDS, FOR USE IN FORMING THERMALLY DEVELOPABLE PHOTO DIAZO PRINTING PAPER ARE DISCLOSED. THESE DIAZO PRINTING PAPERS ARE CHARACTERIZED BY GOOD IMAGE DENSITY, LONG SHELF-LIFE AND GOOD CHEMICAL STABILITY.
Inventors
- 👤 Robert M Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |