Patent US813737A successfully refreshed from Google Patents.
Patent US3586715A successfully refreshed from Google Patents.
US3586715A
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Unsaturated carboxylic salt materials and derivatives thereof
Assignee: Citrique Belge NV SA
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Filing: 1966-07-08
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Granted: 1971-06-22
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Expires: 1986-07-08
Abstract
Abstract THIS INVENTION RELATES TO POLYCABOXYLIC ACIDS HAVING MORE THAN THREE CARBOXYLIC ACID GROUPS AND ALKALI AND ALKALINE EARTH METAL SALTS THEREOF PREPARED BY THE PYROLYSIS OF ALKALINE EARTH METAL SALTS OF CITRIC ACID. THE COMPOUNDS ARE INTERMEDIATES FOR SULFO-ACID MATEIALS USED IN PREPARING SURFACE ACTIVE AGENTS, ION EXCHANGE MATERIALS AND DETERGENTS.
Inventors
- 👤 Fred Smeets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:41
CPC Classifications
C; C08; C08G; C08G75/00; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19; C07; C07B; C07B45/00; C07B45/02; C07C; C07C57/00; C07C57/02; C08G63/00; C08G63/68; C08G63/688; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/334; C08G65/3344
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |