Patent US272684A successfully refreshed from Google Patents.
US272684A
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US
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Feed-water heater for steam-boilers
Assignee: —
•
Filing: —
•
Granted: 1883-02-20
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Expires: 1900-02-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:02
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/22; F22B37/228; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/785; Y10T137/7852; Y10T137/7853; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7932; Y10T137/8593; Y10T137/86348; Y10T137/86372
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) | 1886-02-19 | 1886-08-21 | 1887-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1890-02-19 | 1890-08-21 | 1891-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1894-02-19 | 1894-08-21 | 1895-02-20 | $7700.00 | Window Closed / Lapsed |