Patent US2860164A successfully refreshed from Google Patents.
US2860164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxymethylation of primary and secondary amines
Assignee: Novartis Corp
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Filing: 1957-08-07
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Granted: 1958-11-11
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Expires: 1977-08-07
Abstract
No abstract record available.
Inventors
- 👤 Kroll Harry
- 👤 Florence P Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:20
CPC Classifications
C; C11; C11D; C11D1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD OF CARBOXYMETHYLATING AN ALIPHATIC AMINE HAVING AT LEAST ONE REPLACEABLE HYDROGEN ATOM ATTACHED DIRECTLY TO AN AMINO NITROGEN ATOM, WHICH COMPRISES CONTINUOUSLY ADDING AN AQUEOUS SOLUTION OF GLYCOLONITRILE TO AN AQUEOUS SOLUTION OF THE SAID AMINE CONTAINIG AB INITIO SUFFICIENT STRONG BASE TO MAINTAIN A PH OF AT LEAST 12 THROUGHOUT THE REACTION, AND MAINTAINING THE REACTION MIXTURE OF SAID PH AND AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 85*C. TO THE BOILING POINT OF THE MIXTURE.
Claim 2
Independent Claim
80 words
A METHOD OF CARBOXYMETHYLATING AN ALIPHATIC AMINE HAVING AT LEAST ONE REPLACEABLE HYDROGEN ATOM ATTACHED DIRECTLY TO AN AMINO NITROGEN ATOM, WHICH COMPRISES CONTINUOUSLY ADDING AN AQUEOUS SOLUTION OF GLYCOLONITRILE TO AN AQUEOUS SOLUTION OF THE SAID AMINE CONTAINIG AB INITIO SUFFICIENT STRONG BASE TO MAINTAIN A PH OF AT LEAST 12 THROUGHOUT THE REACTION, AND MAINTAINING THE REACTION MIXTURE OF SAID PH AND AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 85*C. TO THE BOILING POINT OF THE MIXTURE.
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) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |