Patent US2676187A successfully refreshed from Google Patents.
US2676187A
Expired / Lapsed
US
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Preparation of aromatic polybasic acid chlorides
Assignee: EIDP Inc
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Filing: 1953-03-04
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Granted: 1954-04-20
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Expires: 1973-03-04
Abstract
No abstract record available.
Inventors
- 👤 Foster Robert Everett
- 👤 Salzberg Paul Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:07
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/58; C07C51/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
PROCESS OF PREPARING AN AROMATIC POLYCARBOXYLIC ACID CHLORIDE WHICH COMPRISES REACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND ABOVE A TEMPERATURE OF 150* C. CHLORINE WITH AN AROMATIC CARBOCYCLIC COMPOUND HAVING AN EQUAL NUMBER OF METHYL AND CARBOXYL SUBSTITUENTS DIRECTLY ATTACHED TO NUCLEAR CARBON ATOMS.
Claim 2
Dependent Claim
43 words
PROCESS OF PREPARING AN AROMATIC POLYCARBOXYLIC ACID CHLORIDE WHICH COMPRISES REACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND ABOVE A TEMPERATURE OF 150* C. CHLORINE WITH AN AROMATIC CARBOCYCLIC COMPOUND HAVING AN EQUAL NUMBER OF METHYL AND CARBOXYL SUBSTITUENTS DIRECTLY ATTACHED TO NUCLEAR CARBON ATOMS.
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) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |