US3746752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of aromatic carboxylates
Assignee: Phillips Petroleum Co
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Filing: 1971-10-18
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Granted: 1973-07-17
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Expires: 1991-10-18
Abstract
Abstract AN ALKALI METAL SALT OF AN AROMATIC CARBOXYLIC ACID IS RECRYSTALLIZED FROM A WATER SOLUTION IN THE PRESENCE OF AN ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS, ESTERS AND KETONES. THE RECRYSTALLIZED SALT IS THEREAFTER UTILIZED IN A DISPROPORTIONATION PROCESS WHEREIN THE ALKALI METAL SALT IS CONVERTED TO AN AROMATIC POLYCARBOXYLATE CONTAINING AT LEAST ONE ADDITIONAL CARBOXYLATE GROUP.
Inventors
- 👤 D Kuper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:41
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/41; C07C51/416; C07C51/42; C07C51/43
Claims Analysis
Total Claims: 0
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |