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Patent US3537111A successfully refreshed from Google Patents.
US3537111A
Expired / Lapsed
US
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System for controlling water level and recirculation in swimming pools with gutters
Assignee: Individual
•
Filing: 1969-06-25
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Granted: 1970-11-03
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Expires: 1989-06-25
Abstract
No abstract record available.
Inventors
- 👤 George R Whitten Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:36
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1820981A
Cited
US2739939A
Cited
US2932397A
Cited
US3363767A
Cited
US3386107A
Cited
US3391790A
Cited
US3490081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |