US2548845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-hydroxy-2-alkylbenzimidazoles as azo coupling components in diazotypes
Assignee: GAF Chemicals Corp
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Filing: 1948-12-16
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Granted: 1951-04-10
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Expires: 1968-12-16
Abstract
No abstract record available.
Inventors
- 👤 Fred W Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
DIAZOTYPE PHOTOPRINTING MATERIAL HAVING A LIGHT SENSITIVE LAYER COMPRISING A LIGHT SENSITIVE DIAZO COMPOUND, AND AS AN AZO COUPLING COMPONENT, A MEMBER OF THE GROUP CONSISTING OF 4HYDROXYBENZIMIDAZOLE AND 2-ALKYL DERIVATIVES THEREOF IN WHICH THE ALKYL GROUP CONTAINS 1-3 CARBON ATOMS AND SALTS THEREOF.
Claim 2
Dependent Claim
44 words
DIAZOTYPE PHOTOPRINTING MATERIAL HAVING A LIGHT SENSITIVE LAYER COMPRISING A LIGHT SENSITIVE DIAZO COMPOUND, AND AS AN AZO COUPLING COMPONENT, A MEMBER OF THE GROUP CONSISTING OF 4HYDROXYBENZIMIDAZOLE AND 2-ALKYL DERIVATIVES THEREOF IN WHICH THE ALKYL GROUP CONTAINS 1-3 CARBON ATOMS AND SALTS THEREOF.
References Cited (Backward Citations)
US2150565A
Cited
US2212959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |