Patent US2672418A successfully refreshed from Google Patents.
US2672418A
Expired / Lapsed
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Light-sensitive diazotype material
Assignee: Keuffel and Esser Co
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Filing: 1951-01-04
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Granted: 1954-03-16
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Expires: 1971-01-04
Abstract
No abstract record available.
Inventors
- 👤 Neugebauer Wilhelm
- 👤 Tomanek Martha
- 👤 Bottger Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:48
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
AS A NEW ARTICLE OF MANUFACTURE DIAZOTYPE PHOTOSENSITIVE MATERIAL COMPRISING A BASE AND A LIGHT-SENSITIVE LAYER ON SAID BASE CONTAINING AN AZO COUPLING COMPONENT SELECTED FROM THE GROUP CONSISTING OF 2,3-DIHYDROXY-NAPHTHALENE-6-SULFONIC ACID AND ITS SALTS AND A DIAZO COMPOUND OF A PARA-DIAMINO-BENZENE SELECTED FROM THE GROUP CONSISTING OF N,N-DIALKYL-P-DIAMINO-BENZENES OF THE GENERAL FORMULA
Claim 2
Dependent Claim
53 words
AS A NEW ARTICLE OF MANUFACTURE DIAZOTYPE PHOTOSENSITIVE MATERIAL COMPRISING A BASE AND A LIGHT-SENSITIVE LAYER ON SAID BASE CONTAINING AN AZO COUPLING COMPONENT SELECTED FROM THE GROUP CONSISTING OF 2,3-DIHYDROXY-NAPHTHALENE-6-SULFONIC ACID AND ITS SALTS AND A DIAZO COMPOUND OF A PARA-DIAMINO-BENZENE SELECTED FROM THE GROUP CONSISTING OF N,N-DIALKYL-P-DIAMINO-BENZENES OF THE GENERAL FORMULA
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) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |