Drip irrigation system
Patent 4210287 Issued on July 1, 1980. Estimated Expiration Date: 
November 21, 1998. 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 21, 1998. 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 References 3797754 3807430 3870236 Flow restrictor and trickle emitter Drip level irrigation Fluid flow regulator Patent #: 4077571 InventorApplicationNo. 05/962688 filed on 11/21/1978US Classes:239/542, CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR239/109, Reduction of fluid pressure affects opening (e.g., self-draining showers)239/547DISTRIBUTOR OR NOZZLE IN CIRCUMFERENTIAL WALL OF FLEXIBLE SUPPLY LINEExaminersPrimary: Saifer, Robert W.Attorney, Agent or FirmInternational ClassA01G 25/02 (20060101)Foreign Application Priority Data1977-11-24 ILAbstractA drip irrigation system comprising a thin walled thermoplastic conduit having an axially directed thick wall portion, discrete, substantially flat emitter units being heat welded to axial spaced apart locations of an inner surface of said thick wall portion adjacent outlet apertures formed in said thick wall portion, the emitter units being preferably provided with an elastomeric membrane exposed to the throughflow pressure in the conduit for the purpose of stabilizing the output rate of each emitter unit vis-a-vis possible flow pressure variations in the conduit.Field of SearchCONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATORDISTRIBUTOR OR NOZZLE IN CIRCUMFERENTIAL WALL OF FLEXIBLE SUPPLY LINE With means for enlarging spray openings beyond normal operating position With separate fluid reacting surface Reduction of fluid pressure affects opening (e.g., self-draining showers) | |
