Irrigation pipes with dripper units and method of its manufacture
Patent 3981452 Issued on September 21, 1976. Estimated Expiration Date: 
September 21, 1993. 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.
September 21, 1993. 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 3604728 3729142 3806036 3887138 3897009 InventorApplicationNo. 05/548736 filed on 02/10/1975US Classes:239/542CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATORExaminersPrimary: Song, Robert R.Assistant: Church, Gene A. Attorney, Agent or FirmInternational ClassesA01G 25/02 (20060101)B29C 47/02 (20060101) A01G 25/00 (20060101) AbstractAn irrigation pipe constitutes at predetermined spacings the outer sleeve of an irrigation unit, whose inner part comprises a cylinder with a peripheral helical groove. A method for producing such a pipe comprises feeding said cylinder at predetermined intervals into an extruder having an angular extrusion nozzle head and extruding said pipe around it, and after cooling said pipe sufficiently making at least one aperture therein aligned with the forward end of said groove in said cylinder.Field of SearchCONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR | |
