US2824128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phenolic ethylenediaminepolycarboxylic acids
Assignee: Novartis Corp
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Filing: 1956-02-03
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Granted: 1958-02-18
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Expires: 1976-02-03
Abstract
No abstract record available.
Inventors
- 👤 Dexter Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:39
CPC Classifications
C; C05; C05D; C05D9/00; C05D9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PROCESS FOR THE PREPARATION OF AN ETHYLENE-BIS(A-IMINO-HYDROXYPHENYLACETIC ACID), WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN ABOUT 70* AND ABOUT 100* C. AND AT A PH BETWEEN ABOUT 8 AND ABOUT 10, A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
37 words
A PROCESS FOR THE PREPARATION OF AN ETHYLENE-BIS(A-IMINO-HYDROXYPHENYLACETIC ACID), WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN ABOUT 70* AND ABOUT 100* C. AND AT A PH BETWEEN ABOUT 8 AND ABOUT 10, A COMPOUND OF THE FORMULA
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) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |