US620231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cleaning water-heaters
Assignee: —
•
Filing: —
•
Granted: 1899-02-28
•
Expires: 1916-02-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:46
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00485; F; F16; F16K; F16K11/00; F16K11/10; F16K11/20; F16K11/22; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3112; Y10T137/8593; Y10T137/87265; Y10T137/87338; Y10T137/87362
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) | 1902-02-28 | 1902-08-30 | 1903-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1906-02-28 | 1906-08-30 | 1907-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1910-02-28 | 1910-08-30 | 1911-03-01 | $7700.00 | Window Closed / Lapsed |