Patent US3566607A successfully refreshed from Google Patents.
US3566607A
Expired / Lapsed
US
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Corrugated drainage tubes
Assignee: Advanced Drainage Systems Inc
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Filing: 1968-02-14
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Granted: 1971-03-02
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Expires: 1988-02-14
Abstract
Abstract A FLEXIBLE CORRUGATED DRAINAGE TUBE HAVING ALTERNATING ANNULAR PEAKS AND VALLEYS AND A PLURALITY OF OPENINGS ARRANGED TRANSVERSELY TO THE LONGITUDINAL AXIS OF THE TUBE. FILTER MEDIA COVERS THE SLOTTED OPENINGS SO THAT LIQUID DRAINING THROUGH THE OPENINGS INTO THE INTERIOR OF THE TUBE INITIALLY PASSES THROUGH THE FILTER MEDIA.
Inventors
- 👤 Marty E Sixt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:54
CPC Classifications
E; E02; E02B; E02B11/00; E02B11/005
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |