Patent US2755185A successfully refreshed from Google Patents.
US2755185A
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Method of improving rate of ammonia development of light sensitive diazotype materials
Assignee: GAF Chemicals Corp
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Filing: 1953-11-23
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Granted: 1956-07-17
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Expires: 1973-11-23
Abstract
No abstract record available.
Inventors
- 👤 Jr John Sulich
- 👤 Jr Clifford E Herrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:11
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A DRY DEVELOPING LIGHT SENSITIVE DIAZOTYPE MATERIAL COMPRISING A BASE COATED WITH A LIGHT SENSITIVE DIAZONIUM COMPOUND, AN AZO DYE COUPLING COMPONENT AND A THIOUREA DERIVATIVE, CAPABLE OF ACCELERATING THE RATE OF AMMONIA DEVELOPMENT OF SAID LIGHT SENSITIVE DIAZOTYPE MATERIAL AFTER EXPOSURE THEREOF, ONE NITROGEN ATOM OF WHICH IS JOINED THROUGH A METHYLENE GROUP TO A STRONG NEGATIVE GROUPING OF CARBON ATOMS CONTAINING A >C=C< RADICAL DIRECTLY LINKED TO SAID METHYLENE GROUP, AND THE OTHER NITROGEN ATOM OF WHICH IS STRONGLY BASIC BY VIRTUE OF A CHEMICAL STRUCTURE SELECTED FROM THE CLASS CONSISTING OF THOSE IN WHICH THE NITROGEN ATOM IS SUBSTITUTED BY AN ALIPHATIC RADICAL AND THOSE IN WHICH THE NITROGEN ATOM FORMS PART OF A SATURATED HETEROCYCLIC RING.
Claim 2
Dependent Claim
120 words
A DRY DEVELOPING LIGHT SENSITIVE DIAZOTYPE MATERIAL COMPRISING A BASE COATED WITH A LIGHT SENSITIVE DIAZONIUM COMPOUND, AN AZO DYE COUPLING COMPONENT AND A THIOUREA DERIVATIVE, CAPABLE OF ACCELERATING THE RATE OF AMMONIA DEVELOPMENT OF SAID LIGHT SENSITIVE DIAZOTYPE MATERIAL AFTER EXPOSURE THEREOF, ONE NITROGEN ATOM OF WHICH IS JOINED THROUGH A METHYLENE GROUP TO A STRONG NEGATIVE GROUPING OF CARBON ATOMS CONTAINING A >C=C< RADICAL DIRECTLY LINKED TO SAID METHYLENE GROUP, AND THE OTHER NITROGEN ATOM OF WHICH IS STRONGLY BASIC BY VIRTUE OF A CHEMICAL STRUCTURE SELECTED FROM THE CLASS CONSISTING OF THOSE IN WHICH THE NITROGEN ATOM IS SUBSTITUTED BY AN ALIPHATIC RADICAL AND THOSE IN WHICH THE NITROGEN ATOM FORMS PART OF A SATURATED HETEROCYCLIC RING.
References Cited (Backward Citations)
US2487034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |