US3268585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auramine process using sulfamic acid
Assignee: Wyeth Holdings LLC
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Filing: 1963-07-03
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Granted: 1966-08-23
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Expires: 1983-07-03
Abstract
No abstract record available.
Inventors
- 👤 Grosklos Rill Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:56
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR THE PREPARATION OF AN AURAMINE SALT WHICH COMPRISES HEATING TO A TEMPERATURE BETWEEN 120* AND 200*C., A MIXTURE OF: (A) P,P''-(DIMETHYLDIAMINO)DIPHENYLMETHANE; (B) 0.25-0.5 PART BY WEIGHT OF SULFUR, BASED ON THE WEIGHT OF (A); (C) AT LEAST 0.3 PARTS BY WEIGHT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SULFAMIC ACID AND AMMONIUM SULFAMATE PER PART OF (A); AND (D) AT LEAST ABOUT ONE PART BY WEIGHT OF UREA PER PART OF (A); AND RECOVERING THE AURAMINE PRODUCT THUS FORMED.
Claim 2
Dependent Claim
84 words
A PROCESS FOR THE PREPARATION OF AN AURAMINE SALT WHICH COMPRISES HEATING TO A TEMPERATURE BETWEEN 120* AND 200*C., A MIXTURE OF: (A) P,P''-(DIMETHYLDIAMINO)DIPHENYLMETHANE; (B) 0.25-0.5 PART BY WEIGHT OF SULFUR, BASED ON THE WEIGHT OF (A); (C) AT LEAST 0.3 PARTS BY WEIGHT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SULFAMIC ACID AND AMMONIUM SULFAMATE PER PART OF (A); AND (D) AT LEAST ABOUT ONE PART BY WEIGHT OF UREA PER PART OF (A); AND RECOVERING THE AURAMINE PRODUCT THUS FORMED.
References Cited (Backward Citations)
US3112326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |