US3235491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of flocculating mineral solids colloidally suspended in an aqueous medium
Assignee: WR Grace and Co
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Filing: 1962-09-20
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Granted: 1966-02-15
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Expires: 1982-09-20
Abstract
No abstract record available.
Inventors
- 👤 Henry C Rosenberg
- 👤 Frederick R Steward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:18
CPC Classifications
C; C02; C02F; C02F9/00; B; B03; B03B; B03B1/00; C02F2101/00; C02F2101/10; C02F2101/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD OF FLUCCULATING SILICEOUS MINERAL SOLIDS COLLOIDALLY SUSPENDED IN AN AQUEOUS MEDIUM CONTAINING AT LEAST 0.5 PART PER MILLION FERRIC IONS WHICH COMPRISES ADDING AMMONIA TO SAID MEDIUM IN AN AMOUNT OF FROM 6 TO 20 PARTS PER MILLION, WHILE SAID MEDIUM HAS A PH SUFFICIENTLY HIGH TO CAUSE FORMATION OF INSOLUBLE FERRIC HYDROXIDE, AND SETTLING THE RESULTING AGGLOMERATED SILICEOUS PARTICLES.
Claim 2
Independent Claim
62 words
A METHOD OF FLUCCULATING SILICEOUS MINERAL SOLIDS COLLOIDALLY SUSPENDED IN AN AQUEOUS MEDIUM CONTAINING AT LEAST 0.5 PART PER MILLION FERRIC IONS WHICH COMPRISES ADDING AMMONIA TO SAID MEDIUM IN AN AMOUNT OF FROM 6 TO 20 PARTS PER MILLION, WHILE SAID MEDIUM HAS A PH SUFFICIENTLY HIGH TO CAUSE FORMATION OF INSOLUBLE FERRIC HYDROXIDE, AND SETTLING THE RESULTING AGGLOMERATED SILICEOUS PARTICLES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |