Patent US3574816A successfully refreshed from Google Patents.
US3574816A
Expired / Lapsed
US
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Process for treating rice husk
Assignee: Individual
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Filing: 1968-03-06
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Granted: 1971-04-13
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Expires: 1988-03-06
Abstract
Abstract PROCESS FOR TREATING RECE HUST COMPRISING ROASTING THE RICE HUSK DURING LESS THAN 60 SECONDS, IN THE PRESENCE OF OXYGEN UNTIL THE RICE HUSK HAS LOST 30-70% OF ITS WEIGHT, MIXING THE RICE HUSK AS SO OBTAINED WITH AT LEAST 10% BY WEIGHT OF A WATER-SOLUBLE COMPOUND OF CALCIUM SALTS TO FORM A MIXTURE, MOISTENING SAID MIXTURE WITH AN AQUEOUS SOLUTION OF AN ALUMINUM COMPOUND AND, AS A CATALYST, PIPERIDINE, DIPHENYLUREA AND AMINOGUANIDINE HYDROCHLORIDE, WHILST MAINTAINING THE PH OF THE MIXTURE ABOVE 7, COMPACTING THE MOISTENED MIXTURE AND, AFTER AGING THE PRESSED PORDUCT CONTACTING IT WITH WATER AND THEN DRYING THE MOIST PRODUCT.
Inventors
- 👤 Ala El Dine Abbdellatif
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:31
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B18/00; C04B18/04; C04B18/06; C04B18/10; C04B18/101; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |