Patent EP0381448A2 successfully refreshed from Google Patents.
US3586715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated carboxylic salt materials and derivatives thereof
Assignee: Citrique Belge NV SA
•
Filing: 1966-07-08
•
Granted: 1971-06-22
•
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 17:41
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |