US3282857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aquasols of crystalline zirconia and/or hafnia
Assignee: WR Grace and Co
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Filing: 1962-12-21
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Granted: 1966-11-01
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick T Fitch
- 👤 Jean G Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:40
CPC Classifications
C; C01; C01G; C01G27/00; C01G27/02; B; B82; B82Y; B82Y30/00; C01G25/00; C01G25/02; C01P; C01P2002/00; C01P2002/02; C01P2002/70; C01P2004/00; C01P2004/30; C01P2004/50; C01P2004/54; C01P2004/60; C01P2004/61; C01P2004/64; C01P2006/00; C01P2006/22; C01P2006/40; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A PROCESS FOR PREPARING AQUASOLS OF CRYSTALLINE PARTICLES OF OXIDES OF ELEMENTS SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM AND HAFNIUM WHICH COMPRISES THE STEPS OF: (A) PREPARING AN AQUEOUS SOLUTION OF A BASIC SALT OF SAID ELEMENT, (B) ELECTRODIALYZING SAID SALT SOLUTION TO PREPARE A SOL OF AMORPHOUS PARTICLES IN THE 3 TO 7 MILLIMICRON SIZE RANGE, (C) HEATING SAID SOL IN A CLOSED VESSEL AT A TEMPERATURE OF 100 TO 200*C. FOR ABOUT 1 TO 40 HOURS TO INSURE PARTICLE GROWTH AND CRYSTALLIZATION, (D) COOLING SAID SOL, (E) DEIONIZING, CONCENTRATING TO 10 TO ABOUT 30 PERCENT SOLIDS AND RECOVERING THE PRODUCT SOL.
Claim 2
Dependent Claim
104 words
A PROCESS FOR PREPARING AQUASOLS OF CRYSTALLINE PARTICLES OF OXIDES OF ELEMENTS SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM AND HAFNIUM WHICH COMPRISES THE STEPS OF: (A) PREPARING AN AQUEOUS SOLUTION OF A BASIC SALT OF SAID ELEMENT, (B) ELECTRODIALYZING SAID SALT SOLUTION TO PREPARE A SOL OF AMORPHOUS PARTICLES IN THE 3 TO 7 MILLIMICRON SIZE RANGE, (C) HEATING SAID SOL IN A CLOSED VESSEL AT A TEMPERATURE OF 100 TO 200*C. FOR ABOUT 1 TO 40 HOURS TO INSURE PARTICLE GROWTH AND CRYSTALLIZATION, (D) COOLING SAID SOL, (E) DEIONIZING, CONCENTRATING TO 10 TO ABOUT 30 PERCENT SOLIDS AND RECOVERING THE PRODUCT SOL.
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |