Irrigation conduit and composition and method for producing such
Abstract
Abstract The invention is directed to a composition and the use of this composition to the production of particular articles of manufacture commonly known as irrigation or soaking conduits. According to the process of the invention, a foamable thermoplastic resin composition is extruded in such a way so as to obtain a conduit having a wall structure composed of a cellular body of interconnecting pores. During the extrusion process, the outer surface of the conduit is treated in such a way so as to produce an outer surface or skin which is substantially impervious to water. The conduit thus prepared is then provided with a score line or score lines which destroy the water-impervious nature of the outer surface. In use, these conduits are maintained under water pressure which causes the water seep through the pores of the wall and ultimately to the score lines which permit the water to seep from the conduit. The irrigation or soaking of lands is thereby obtained.
Inventors
- 👤 Lewis C Thomas
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |