Patent US3360552A successfully refreshed from Google Patents.
US3360552A
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Process for the preparation of ethylenediamine bis(o-hydroxyphenylacetic acid) and the mono-amide thereof
Assignee: Novartis Corp
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Filing: 1963-11-27
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Granted: 1967-12-26
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Expires: 1983-11-27
Abstract
No abstract record available.
Inventors
- 👤 Philip G Mccracken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:56
CPC Classifications
C; C07; C07C; C07C255/00; C05; C05D; C05D9/00; C05D9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
IN A PROCESS OF HYDROLYZING ETHYLENEDIAMINE BIS(OHYDROXYPHENYLACETONITRILE) TO A MIXTURE OF ETHYLENEDIAMINE BIS(O-HYDROXYPHENYLACETIC ACID) AND ETHYLENEDIAMINE BIS(O-HYDROXYPHENYLACETIC ACID)-MONOAMIDE IN THE PRESENCE OF HYDROHALIC ACID, THE IMPROVEMENT WHICH CONSISTS IN USING HYDROCHLORIC ACID OF A CONCENTRATION OF OVER 40%.
Claim 2
Dependent Claim
38 words
IN A PROCESS OF HYDROLYZING ETHYLENEDIAMINE BIS(OHYDROXYPHENYLACETONITRILE) TO A MIXTURE OF ETHYLENEDIAMINE BIS(O-HYDROXYPHENYLACETIC ACID) AND ETHYLENEDIAMINE BIS(O-HYDROXYPHENYLACETIC ACID)-MONOAMIDE IN THE PRESENCE OF HYDROHALIC ACID, THE IMPROVEMENT WHICH CONSISTS IN USING HYDROCHLORIC ACID OF A CONCENTRATION OF OVER 40%.
References Cited (Backward Citations)
US3028407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-25 | 1971-06-26 | 1971-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-25 | 1975-06-26 | 1975-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-25 | 1979-06-26 | 1979-12-26 | $7700.00 | Window Closed / Lapsed |