US445909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler-purge feeder
Assignee: —
•
Filing: —
•
Granted: 1891-02-03
•
Expires: 1908-02-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:23
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/686; B; B01; B01F; B01F25/00; B01F25/30; B01F25/31; B01F25/316; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3112; Y10T137/8158; Y10T137/8359; Y10T137/8593; Y10T137/87265; Y10T137/87338; Y10T137/87346
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) | 1894-02-02 | 1894-08-04 | 1895-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1898-02-02 | 1898-08-04 | 1899-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1902-02-03 | 1902-08-05 | 1903-02-04 | $7700.00 | Window Closed / Lapsed |