US2810753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal ion chelating agents
Assignee: Dow Chemical Co
•
Filing: 1954-05-24
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Granted: 1957-10-22
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Expires: 1974-05-24
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Bersworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:16
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
THE COMPOUND DISULFHYDRYL ALKYLENE DIAMINE POLYCARBOXYLIC ACID HAVING FROM 2 TO 4 CARBOXYLIC GROUPS AND CONFORMING TO THE FOLLOWING STRUCTURE:
Claim 2
Dependent Claim
20 words
THE COMPOUND DISULFHYDRYL ALKYLENE DIAMINE POLYCARBOXYLIC ACID HAVING FROM 2 TO 4 CARBOXYLIC GROUPS AND CONFORMING TO THE FOLLOWING STRUCTURE:
Claim 3
Independent Claim
17 words
THE METHOD OF MAKING DISULFHYDRYL ALKYLENE DIAMINE DICARBOXYLIC ACIDS AND ALKALI METAL SALTS CONFORMING TO THE STRUCTURE:
Claim 4
Independent Claim
17 words
THE METHOD OF MAKING DISULFHYDRYL ALKYLENE DIAMINE DICARBOXYLIC ACIDS AND ALKALI METAL SALTS CONFORMING TO THE STRUCTURE:
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) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |