Patent US159728A successfully refreshed from Google Patents.
US159728A
Expired / Lapsed
US
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Improvement in feed-water heaters
Assignee: —
•
Filing: —
•
Granted: 1875-02-09
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Expires: 1892-02-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:12
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0202; F28F9/0204; F28F9/0209; F28F9/0212; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/471
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) | 1878-02-08 | 1878-08-10 | 1879-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1882-02-08 | 1882-08-10 | 1883-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1886-02-08 | 1886-08-10 | 1887-02-09 | $7700.00 | Window Closed / Lapsed |