US2694703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 4-arylazo-5-pyrazolones
Assignee: Eastman Kodak Co
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Filing: 1952-01-31
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Granted: 1954-11-16
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Expires: 1972-01-31
Abstract
No abstract record available.
Inventors
- 👤 Graham Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:31
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3647; C09B29/3652; C09B29/366
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
THE METHOD OF PREPARING A 4-ARYLAZO-5-PYRAZOLONE WHICH COMPRISES CONDENSING AN ARYLDIAZONIUM CHLORIDE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 4CARBOXYACYL - 5 - PYRAZOLONES, 5-ACYLOXYPYRAZOLES, AND 4-CARBOXYACYL-5-ACYLOXYPRAZOLES AT THE 4-POSITION OF SAID COMPOUND.
Claim 2
Independent Claim
35 words
THE METHOD OF PREPARING A 4-ARYLAZO-5-PYRAZOLONE WHICH COMPRISES CONDENSING AN ARYLDIAZONIUM CHLORIDE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 4CARBOXYACYL - 5 - PYRAZOLONES, 5-ACYLOXYPYRAZOLES, AND 4-CARBOXYACYL-5-ACYLOXYPRAZOLES AT THE 4-POSITION OF SAID COMPOUND.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |