Patent US3716873A successfully refreshed from Google Patents.
US3716873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swimming pool skimmer with demountable weir
Assignee: Marine Swimming Pool Equipment Co
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Filing: 1971-12-03
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Granted: 1973-02-20
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Expires: 1991-12-03
Abstract
Abstract A WEIR OF FLEXIBLE, ELASTIC SHEET MATERIAL HAVING, ALONG ONE MARGIN THEREOF AN INTEGRAL OPEN SLEEVE WITH A LONGITUDINALLY EXTENDING GAP NARROWER THAN THE DIAMETER OF A PIVOT PIN ON WHICH THE WEIR IS FULCRUMED, IS ATTACTED TO THE PIN BY PRESSING THE MARGINS OF THE GAP AGAINST THE PIN TO SPRING OPEN THE SLEEVE AND RECEIVE THE PIN THEREWITHIN. THE PIN IS STIFF BUT FLEXIBLE TUBE WHICH IS MOUNTED BETWEEN OPPOSED WALLS OF A SKIMMER THROAT BY FLEXING IT TO SPRING ITS ENDS INTO SOCKETS IN SUCH WALLS. D R A W I N G
Inventors
- 👤 P Blum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:03
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/12; E04H4/1209; E04H4/1272
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |