Patent US2957009A successfully refreshed from Google Patents.
US2957009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal salts of open-chain dihydroxydioic acids and esters, their monolactone acids, salts, esters, and amides and their preparation
Assignee: EIDP Inc
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Filing: 1955-11-25
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Granted: 1960-10-18
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Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
- 👤 Howard E Holmquist
- 👤 John C Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:27
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07C; C07C51/00; C07C51/09; C07C51/41; C07C51/412; C07D309/00; C07D309/34; C07D309/36; C07D309/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
PROCES FOR PREPARING MONOLACTONES WHICH COMPRISES REACTING ($2,2''(5H,5''H)-BIFURAN)-5,5''-DIONE WITH AN ALKALI METAL ALKOXIDE OF 1 TO 12 CARBON ATOMS IN AN ALKANOL OF 1 TO 12 CARBON ATOMS, ACIDIFYING THE RESULTING REACTION MIXTURE WITH AN ACID SELECTED FROM THE CLASS CONSISTING OF ACETIC, HYDROCHLORIC, AND PHOSPHORIC ACIDS, AND SEPARATING AS THE RESULTING PRODUCT A GAMMA-MONOLACTONE ALKYL MONESTER OF 4,5-DIHYDROXY-2,4,6-OCTATRIENE1,8-DIOIC ACID WHEREIN THE ALKYL RADICAL IS OF 1 TO 12 CARBON ATOMS.
Claim 2
Dependent Claim
71 words
PROCES FOR PREPARING MONOLACTONES WHICH COMPRISES REACTING ($2,2''(5H,5''H)-BIFURAN)-5,5''-DIONE WITH AN ALKALI METAL ALKOXIDE OF 1 TO 12 CARBON ATOMS IN AN ALKANOL OF 1 TO 12 CARBON ATOMS, ACIDIFYING THE RESULTING REACTION MIXTURE WITH AN ACID SELECTED FROM THE CLASS CONSISTING OF ACETIC, HYDROCHLORIC, AND PHOSPHORIC ACIDS, AND SEPARATING AS THE RESULTING PRODUCT A GAMMA-MONOLACTONE ALKYL MONESTER OF 4,5-DIHYDROXY-2,4,6-OCTATRIENE1,8-DIOIC ACID WHEREIN THE ALKYL RADICAL IS OF 1 TO 12 CARBON ATOMS.
Claim 3
Dependent Claim
45 words
PROCESS FOR PREPARING ALKALI METAL SALTS OF OPENCHAIN DIHYDROXY-DIOIC ACIDS WHICH COMPRISES REACTING ($2,2''(5H,5''H)-BIFURAN)-5,5''-DIONE WITH AN ALKALI METAL HYDROXIDE IN AQUEOUS MEDIUM, ACIDIFYING THE RESULTING REACTION MIXTURE WITH ACETIC ACID, AND SEPARATING AS THE RESULTING PRODUCT AN ALKALI METAL SALT OF THE OPEN-CHAIN 4,5-DIHYDROXY-2,4,6-OCTATRIENE-1,8-DIOIC ACID.
Claim 4
Dependent Claim
45 words
PROCESS FOR PREPARING ALKALI METAL SALTS OF OPENCHAIN DIHYDROXY-DIOIC ACIDS WHICH COMPRISES REACTING ($2,2''(5H,5''H)-BIFURAN)-5,5''-DIONE WITH AN ALKALI METAL HYDROXIDE IN AQUEOUS MEDIUM, ACIDIFYING THE RESULTING REACTION MIXTURE WITH ACETIC ACID, AND SEPARATING AS THE RESULTING PRODUCT AN ALKALI METAL SALT OF THE OPEN-CHAIN 4,5-DIHYDROXY-2,4,6-OCTATRIENE-1,8-DIOIC ACID.
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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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |