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US 3,939,875 AGranted
Permeable flexible plastic tubing
AssigneeBoyle and Osborn
InventorsRobert O. Osborn, Donn G. Boyle
Life of this patent
Estimating the term…
Abstract
Flexible tubing, particularly suitable for irrigation purposes, consists of a plurality of superposed, elongated, flexible strips, heat sealed along their longitudinal edges and is substantially flat when empty. At least one of said strips is thermoplastic and at least one has a permeable, fibrous structure and is preferably formed from a non-woven fabric such as spun-bonded polyethylene fiber.
Claims5
Flexible thermoplastic tubing adapted for use which comprises:
- a plurality of superposed, elongated, flexible thermoplastic strips, said strips being firmly heat-sealed together along their longitudinal edges;
- at least one of said strips having a permeable, fibrous structure and consisting of a non-woven fabric formed of spun-bonded polyethylene fiber, communication between the inside of said tubing and the outside thereof being provided by the pores in said permeable strip.
Dependencies are inferred from the claim text.