US1541584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making vitreous silica
Assignee: General Electric Co
•
Filing: 1921-08-10
•
Granted: 1925-06-09
•
Expires: 1941-08-10
Abstract
No abstract record available.
Inventors
- 👤 Levi B Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:17
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/02; C03B5/033; C03B5/0334; C03B17/00; C03B17/04; C03B5/021; C03B5/16; C03B5/225; C03B5/2255
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) | 1928-06-08 | 1928-12-08 | 1929-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-06-08 | 1932-12-08 | 1933-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-06-08 | 1936-12-08 | 1937-06-09 | $7700.00 | Window Closed / Lapsed |