Drip irrigation tape
Patent 4807668 Issued on February 28, 1989. Estimated Expiration Date: 
November 20, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 20, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 07/124332 filed on 11/20/1987US Classes:138/103, COMBINED138/128, Longitudinally seamed138/178, MISCELLANEOUS138/42, Tortuous path239/542, CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR239/547, DISTRIBUTOR OR NOZZLE IN CIRCUMFERENTIAL WALL OF FLEXIBLE SUPPLY LINE405/47Flow through jointExaminersPrimary: Bryant, III, James E.Attorney, Agent or FirmInternational ClassA01G 25/02 (20060101)AbstractA plastic drip irragation tape of unitary construction is disclosed that employs a water impervious polyethylene film folded lengthwise with the edges overlapped and joined together in a heat sealed seam to form a flat flexible conduit. A narrow preformed groove along one edge defines a small secondary conduit within the seam that resists deformation to maintain a consistent controlled drip rate along the tape. Breaks in the seam at regular intervals form inlets through which irrigation water flows from the main conduit into the secondary conduit and outlets through which the water is emitted from the secondary conduit to the soil. | |
