Patent US2223028A successfully refreshed from Google Patents.
Patent US3004602A successfully refreshed from Google Patents.
Patent US2408654A successfully refreshed from Google Patents.
US2408654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicic acid sols
Assignee: EIDP Inc
•
Filing: 1942-04-18
•
Granted: 1946-10-01
•
Expires: 1962-04-18
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:38
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/145; C01B33/141; C01B33/142; C01B33/143
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1949-09-30 | 1950-04-01 | 1950-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-09-30 | 1954-04-01 | 1954-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-09-30 | 1958-04-01 | 1958-10-01 | $7700.00 | Window Closed / Lapsed |