US2650200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making a concentrated silica sol
Assignee: EIDP Inc
•
Filing: 1951-12-14
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Granted: 1953-08-25
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Expires: 1971-12-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph K Iler
- 👤 Frederick J Wolter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:30
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/142; C01B33/143; C01B33/1435
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN A PROCESS FOR MAKING A CONCENTRATED SILICA SOL THE STEPS COMPRISING ADDING AN ALKALI METAL SILICATE TO A SILICA SOL, THE ALKALI METAL ION CONCENTRATION OF THE MIXTURE BEING LESS THAN 0.7 NORMAL AND THE PH BEING ABOVE 8, AND CONTACTING THE MIXTURE WITH THE AMMONIUM FORM OF A CATION-EXCHANGER.
Claim 2
Dependent Claim
51 words
IN A PROCESS FOR MAKING A CONCENTRATED SILICA SOL THE STEPS COMPRISING ADDING AN ALKALI METAL SILICATE TO A SILICA SOL, THE ALKALI METAL ION CONCENTRATION OF THE MIXTURE BEING LESS THAN 0.7 NORMAL AND THE PH BEING ABOVE 8, AND CONTACTING THE MIXTURE WITH THE AMMONIUM FORM OF A CATION-EXCHANGER.
References Cited (Backward Citations)
US2244325A
Cited
US2457971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |