Patent US3318218A successfully refreshed from Google Patents.
Patent US2552355A successfully refreshed from Google Patents.
US2552355A
Expired / Lapsed
US
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Diazotype layers having organic esters and nitriles containing an active methylene group as azo components
Assignee: GAF Chemicals Corp
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Filing: 1947-08-06
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Granted: 1951-05-08
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Expires: 1967-08-06
Abstract
No abstract record available.
Inventors
- 👤 Glahn William H Von
- 👤 Lester N Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A DIAZOTYPE PHOTOPRINTING MATERIAL COMPRISING A LIGHT SENSITIVE DIAZONIUM SALT OF A PDIAMINE OF THE BENZENE SERIES AND AN AZO COMPONENT SELECTED FROM THE GROUP CONSISTING OF ORGANIC ESTERS AND NITRILES OF THE FOLLOWING FORMULA
Claim 2
Dependent Claim
35 words
A DIAZOTYPE PHOTOPRINTING MATERIAL COMPRISING A LIGHT SENSITIVE DIAZONIUM SALT OF A PDIAMINE OF THE BENZENE SERIES AND AN AZO COMPONENT SELECTED FROM THE GROUP CONSISTING OF ORGANIC ESTERS AND NITRILES OF THE FOLLOWING FORMULA
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Cited
US2435661A
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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) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |