Drainage tile
Abstract
Abstract THE DISCLOSURE OF THE PRESENT INVENTION INCLUDES A DESCRIPTION OF A TITLE WHICH IS SUITABLE FOR USE IN THE FORMATION OF GROUND WATER DRAINAGE CHANNELS AND THE LIKE AND A SHIPPER LOAD CONSISTING OF A PLURALITY OF TILES STACKED ONE ON TOP OF THE OTHER TO FORM A STABLE SHIPPER LOAD. THE TILE IS GENERALLY ARCH-SHAPED AND IS FORMED WITH A PAIR OF SUPPORT SHOULDERS WHICH EXTEND HORIZONTALLY OUTWARDLY FROM THE OUTER SURFACE OF THE ARCH-SHAPED TILE TO SUPPORT A SIMILAR TILE STACKED ON TOP OF A FIRST SUCH TILE. THE DRAINAGE CHANNELS MAY BE MADE FROM A SINGLE LAYER OF TILES OR A PLURALITY OF LAYERS OF TILES ARRANGED ONE ON TOP OF THE OTHER. THE SHIPPER PACKAGE IS FORMED BY ARRANGING THE TILES IN A PLURALITY OF LAYERS ONE ON TOP OF THE OTHER.
Inventors
- 👤 Dennis G Roberts
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |