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US Patent 4807668 - Drip irrigation tape
US Patent Issued on February 28, 1989
Estimated Patent Expiration Date:
November 20, 2007Estimated 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.
Estimated Patent Expiration Date:
November 20, 2007Estimated 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.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. | InventorApplicationNo. 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 jointField of Search138/128, Longitudinally seamed138/103, COMBINED138/177, STRUCTURE138/178, MISCELLANEOUS138/151, With longitudinal seam138/156, LONGITUDINALLY SEAMED138/170Permanent type seamExaminersPrimary: Bryant, III, James E.Attorney, Agent or FirmUS Patent ReferencesRe28095, 1761281, 3361359, 3426544, 3549223, 3613357, 3669357, 3672345, 3727345, 3736755, 3739522, 3774850, 3797754, 3860179, 3866833, 3870236, 3872621, 3874598, 3887138, 3887139, 3899135, 3903929, 3939875, Permeable flexible plastic tubingIssued on: 02/24/1976 Inventor: Osborn , et al.3946762, Underground irrigation system Issued on: 03/30/1976 Inventor: Green3988396, Aeration tubing system Issued on: 10/26/1976 Inventor: Stannard3998392, Easily movable irrigation sprinkler system Issued on: 12/21/1976 Inventor: St. Clair4009832, Irrigation means for the uniform distribution of liquid Issued on: 03/01/1977 Inventor: Tiedt4022384, Irrigation tubing Issued on: 05/10/1977 Inventor: Hoyle , et al.4047995, Hoses for irrigation by dripping and the like and the process to manufacture the same Issued on: 09/13/1977 Inventor: Leal-Diaz4053109, Water conducting and emitting device Issued on: 10/11/1977 Inventor: Gilead4061272, Irrigation device Issued on: 12/06/1977 Inventor: Winston4123006, Spray pipe for use in a pipe line Issued on: 10/31/1978 Inventor: Yukishita4126998, Irrigation apparatus Issued on: 11/28/1978 Inventor: Gilead4139159, Flexible multilayer tubular structure for irrigation and process for its preparation Issued on: 02/13/1979 Inventor: Inoue , et al.4170044, Hydrotherapy apparatus and ducting therefor Issued on: 10/09/1979 Inventor: Steimle4173309, Flow control devices particularly useful for drip irrigation Issued on: 11/06/1979 Inventor: Drori4177946, Integral drip irrigation system Issued on: 12/11/1979 Inventor: Sahagun-Barragan4210287, Drip irrigation system Issued on: 07/01/1980 Inventor: Mehoudar4247051, Irrigation hose and method for its construction Issued on: 01/27/1981 Inventor: Allport4285472, Water dropping type irrigation pipe Issued on: 08/25/1981 Inventor: Okada , et al.4385727, Irrigation emitter tube Issued on: 05/31/1983 Inventor: Spencer4473191, Drip irrigation system employing flow regulation Issued on: 09/25/1984 Inventor: Chapin4474330, Drip irrigation conduit and method of making the same Issued on: 10/02/1984 Inventor: Langa4541569, Drip irrigation conduit and method of making the same Issued on: 09/17/1985 Inventor: Langa4626130, Drip irrigation system Issued on: 12/02/1986 Inventor: Chapin4722759Apparatus for fabricating drip irrigation tape Issued on: 02/02/1988 Inventor: Roberts , et al. International ClassA01G 25/02 (20060101) |
