US1815888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering metals and oxides from boiler ash
Assignee: Individual
•
Filing: 1929-04-02
•
Granted: 1931-07-28
•
Expires: 1949-04-02
Abstract
No abstract record available.
Inventors
- 👤 Thaddeus F Baily
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:30
CPC Classifications
C; C22; C22B; C22B5/00; C21; C21B; C21B13/00; C21C; C21C5/00; C21C5/28; C21C5/38; F; F23; F23J; F23J1/00; F23J1/02; Y; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S75/00; Y10S75/958
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) | 1934-07-27 | 1935-01-26 | 1935-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-07-27 | 1939-01-26 | 1939-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-07-27 | 1943-01-26 | 1943-07-28 | $7700.00 | Window Closed / Lapsed |