Patent US2668149A successfully refreshed from Google Patents.
US2668149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of silica sols with lithium hydroxide and product
Assignee: EIDP Inc
•
Filing: 1951-12-03
•
Granted: 1954-02-02
•
Expires: 1971-12-03
Abstract
No abstract record available.
Inventors
- 👤 Ralph K Iler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:58
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/148; C01B33/1485; C01B33/141; C01B33/142; C01B33/143
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
28 words
A SILICA SOL OF SILICA PARTICLES HAVING AN AVERAGE DIAMETER OF 1 TO 150 MILLIMICRONS, THE MOL RATIO OF SIO2:LI2O IN THE SOL BEING FROM 4:1 TO 25:1.
References Cited (Backward Citations)
US2244325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |