US3600329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diatomaceous earth treated with poly-electrolyte product and a new process for producing it
Assignee: Kieselguhr de Mexico SA
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Filing: 1968-10-29
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Granted: 1971-08-17
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Expires: 1988-10-29
Abstract
Abstract DIATOMACEOUS EARTH PRODUCT FOR VARIOUS USES, PARTICULARLY SUITABLE AS A FILTERING AID WITH IMPROVED FILTRATION AND CLARIFICATION RATES, AND METHOD OF MAKING SAID PRODUCT, BY ADDING TO THE DIATOMACEOUS EARTH PRIOR TO DURING OR AFTER CALCINATION AN ANIONIC, NON-IONIC OR CATIONIC POLYELECTROLYTE IN AMOUNTS RANGING FROM ABOUT 5 TO ABOUT 10.000 P.P.M. OF DIATOMACEOUS EARTH.
Inventors
- 👤 Ernesto Enriquez
- 👤 Luis Espinosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:33
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/14
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |