Patent US4088678A successfully refreshed from Google Patents.
US4088678A
Expired / Lapsed
US
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Substituted succinic acid compounds and their use as chelants
Assignee: ChampionX LLC
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Filing: 1976-07-01
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Granted: 1978-05-09
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Expires: 1996-07-01
Abstract
Abstract Substituted succinic acids and salts thereof having the formula: ##STR1## where R is H or ##STR2## and M is H, alkali metal, or an amine, are useful as chelants and stabilizers for heavy metal ions.
Inventors
- 👤 Joseph Matt
- 👤 Manuel Slovinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:26
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/48; C07F9/4808; C07F9/4816; C07F9/30; C07F9/301
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
Substituted succinic acids and salts thereof having the formula: ##STR7## where M is H, alkali metal, ammonia or amine and R is: ##STR8##
Claim 2
Dependent Claim
23 words
Substituted succinic acids and salts thereof having the formula: ##STR7## where M is H, alkali metal, ammonia or amine and R is: ##STR8##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |