US1229324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating silica.
Assignee: Individual
•
Filing: 1917-03-31
•
Granted: 1917-06-12
•
Expires: 1937-03-31
Abstract
No abstract record available.
Inventors
- 👤 Israel Rosenblum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:14
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06
Claims Analysis
Total Claims: 0
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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) | 1920-06-11 | 1920-12-11 | 1921-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-06-11 | 1924-12-11 | 1925-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-06-11 | 1928-12-11 | 1929-06-12 | $7700.00 | Window Closed / Lapsed |