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Patent US2809752A successfully refreshed from Google Patents.
US2809752A
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Swimming pool water level control system
Assignee: Individual
•
Filing: 1954-03-29
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Granted: 1957-10-15
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Expires: 1974-03-29
Abstract
No abstract record available.
Inventors
- 👤 Donald J Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:35
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/12; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/742
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1800378A
Cited
US2701235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |