US2657137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer for the positive diazotype-process containing a borate, a polyhydroxy alcohol, and a coupler component
Assignee: Chemische Fabriek L Van der Grinten NV
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Filing: 1948-07-14
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Granted: 1953-10-27
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Expires: 1968-07-14
Abstract
No abstract record available.
Inventors
- 👤 Kessels Franciscus An Hubertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:39
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A DEVELOPER FOR POSITIVE DIAZOTYPE MATERIAL, COMPRISING AN ALKALI METAL BORATE AS THE PRINCIPAL BUFFERING COMPONENT, AN AZO COUPLING COMPONENT COMPRISING A SUBSTANCE FROM THE GROUP CONSISTING OF PHLOROGLUCINOL AND HYDROXYETHYLAMIDE OF BETAHYDROXY-NAPHTHOIC ACID, AND A CONTENT OF AN ORGANIC POLYHYDROXYL CO MPOUND THAT SOLUBILIZES THE BORATE, SAID COMPOUND HAVING IN ITS MOLECULE AT LEAST THREE ALCOHOLIC HYDROXY GROUPS ATTACHED TO ADJACENT CARBON ATOMS.
Claim 2
Dependent Claim
64 words
A DEVELOPER FOR POSITIVE DIAZOTYPE MATERIAL, COMPRISING AN ALKALI METAL BORATE AS THE PRINCIPAL BUFFERING COMPONENT, AN AZO COUPLING COMPONENT COMPRISING A SUBSTANCE FROM THE GROUP CONSISTING OF PHLOROGLUCINOL AND HYDROXYETHYLAMIDE OF BETAHYDROXY-NAPHTHOIC ACID, AND A CONTENT OF AN ORGANIC POLYHYDROXYL CO MPOUND THAT SOLUBILIZES THE BORATE, SAID COMPOUND HAVING IN ITS MOLECULE AT LEAST THREE ALCOHOLIC HYDROXY GROUPS ATTACHED TO ADJACENT CARBON ATOMS.
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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |