US3556993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface drain with water trap
Assignee: Wifa-Berken AB
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Filing: 1969-05-05
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Granted: 1971-01-19
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Expires: 1989-05-05
Abstract
Abstract A SURFACE DRAIN WHICH IS FLUSH WITH THE SURFACE HAVING A TRAP WITHIN THE SUMP OF THE DRAIN, FORMED BY AN EASILY REMOVABLE BAFFLE AND A MEANS WHEREBY SURFACE WATER THAT DOES NOT GO THROUGH A GRID SET IN THE TOP OF THE DRAIN IS PASSED INTO THE SUMP BY VIRTUE OF A RECESS AROUND THE PERIMETER OF THE GRID BETWEEN THE GRID AND DRAIN CASING WHERE A SURFACE COVERING MATERIAL CAN TERMINATE SO THAT LIQUID SEEPING PAST THE GRID CAN FLOW OVER THE BAFFLE LIP OR TOP AND THENCE INTO THE SUMP.
Inventors
- 👤 Mats Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:30
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/04; E03F5/0407; E03F2005/0416
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |