US2657141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazotype developer composition containing a potassium borate and process of using same
Assignee: Chemische Fabriek L Van der Grinten NV
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Filing: 1953-01-14
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Granted: 1953-10-27
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Expires: 1973-01-14
Abstract
No abstract record available.
Inventors
- 👤 Kessels Franciscus An Hubertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:43
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A DEVELOPER FOR ONE-COMPONENT DIAZOTYPE MATERIAL CONSISTING ESSENTIALLY OF AN AZO COUPLING COMPONENT AND A POTASSIUM BORATE AS THE PRINCIPAL ALKALINE-REACTING SUBSTANCE, SAID DEVELOPER HAVING A SOLUTION PH WITHIN THE RANGE FROM 8.3 TO 10.
Claim 2
Dependent Claim
35 words
A DEVELOPER FOR ONE-COMPONENT DIAZOTYPE MATERIAL CONSISTING ESSENTIALLY OF AN AZO COUPLING COMPONENT AND A POTASSIUM BORATE AS THE PRINCIPAL ALKALINE-REACTING SUBSTANCE, SAID DEVELOPER HAVING A SOLUTION PH WITHIN THE RANGE FROM 8.3 TO 10.
References Cited (Backward Citations)
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US1989065A
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GB403203A
Cited
US2037542A
Cited
US2063832A
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US2091689A
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US2151532A
Cited
US2239704A
Cited
US2241104A
Cited
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 |