US2687431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing nitro phenylenediamines
Assignee: GAF Chemicals Corp
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Filing: 1950-12-20
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Granted: 1954-08-24
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Expires: 1970-12-20
Abstract
No abstract record available.
Inventors
- 👤 Marschall Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:23
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/45; C09; C09B; C09B51/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE PROCESS OF PRODUCING AN ALKALI METAL SALT OF 2-PHENYLAMINO-4-(2-HYDROXYETHYLAMINO)5-NITRO BENZENE SULFONIC ACID WHICH COMPRISES HEATING IN AN AUTOCLAVE TO A TEMPERATURE RANGING FROM 140-160* C. AND ALKALI METAL SALT OF 2-CHLORO4 - (2 - HYDROXYETHYLAMINO) - 5 - NITRO BENZENE SULFONIC ACID, ANILINE, WATER AND MAGNESIUM OXIDE AS THE ACID ACCEPTOR.
Claim 2
Dependent Claim
52 words
THE PROCESS OF PRODUCING AN ALKALI METAL SALT OF 2-PHENYLAMINO-4-(2-HYDROXYETHYLAMINO)5-NITRO BENZENE SULFONIC ACID WHICH COMPRISES HEATING IN AN AUTOCLAVE TO A TEMPERATURE RANGING FROM 140-160* C. AND ALKALI METAL SALT OF 2-CHLORO4 - (2 - HYDROXYETHYLAMINO) - 5 - NITRO BENZENE SULFONIC ACID, ANILINE, WATER AND MAGNESIUM OXIDE AS THE ACID ACCEPTOR.
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) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |