Patent US3135607A successfully refreshed from Google Patents.
US3135607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat development of diazo recording and copying papers which comprise a quaternary ammonium halide
Assignee: Nashua Corp
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Filing: 1961-04-28
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Granted: 1964-06-02
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Expires: 1981-04-28
Abstract
No abstract record available.
Inventors
- 👤 Henry C Hills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:30
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61; G03C1/615
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
THE METHOD OF PRODUCING PERMANENT COPIES OF GRAPHIC INTELLIGENCE WHICH COMPRISES THE STEPS OF PROVIDING A CARRIER SHEET WITH A SENSITIZED LAYER COMPRISING A LIGHT SENSITIVE DIAZONIUM COMPOUND, AN AZO COUPLER COMPOUND, AND A QUATERNARY AMMONIUM HALIDE, THE SAID DIAZONIUM AND AZO COUPLER COMPOUNDS BEING CAPABLE OF REACTING TOGETHER IN AN ALKALINE MEDIUM TO FORM AN AZO DYE, THE SAID QUATERNARY AMMONIUM HALIDE BEING DECOMPOSABLE AT AN ELEVATED TEMPERATURE TO FORM A TERTIARY AMINE IN AN AMOUNT SUFFICIENT TO CAUSE A COUPLING REACTION BETWEEN SAID DIAZONIUM COMPOUND AND SAID AZO COUPLER COMPOUND, SELECTIVELY DECOMPOSING THE SAID DIAZONIUM COMPOUND BY EXPOSING THE SAID LAYER TO A SPECIFIC PATTERN OF ULTRAVIOLET LIGHT, AND HEATING THE SAID LAYER TO A TEMPERATURE IN EXCESS OF THE DECOMPOSITION TEMPERATURE OF THE SAID QUATERNARY AMMONIUM HALIDE.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |