Irrigation tubing
Patent 4022384 Issued on May 10, 1977. Estimated Expiration Date: 
May 10, 1994. 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.
May 10, 1994. 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 R28095 3672571 3777987 3870236 3873030 3887138 3896999 InventorsAssigneeApplicationNo. 05/638964 filed on 12/08/1975US Classes:239/542, CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR138/42, Tortuous path405/43Porous or apertured pipe, flume, or tilewayExaminersPrimary: Haroian, Harry N.Attorney, Agent or FirmInternational ClassA01G 25/02 (20060101)AbstractIrrigation drip tubing including an outer tubular member having an inside wall and an outside wall and an inner tubular member having a repetitious pattern of inlet apertures, crests and roots. The crests engage the inside wall of an outer tubular member in a liquid-tight manner. The roots form conduits which connect to form oppositely directed passageways through which the fluid flows resulting in a pressure drop that drastically reduces the fluid volume flow. The inlet apertures in the inner tubular member provide for fluid communication between the inside of the inner tubular member and the passageway. Removable bosses may optionally cover outlet apertures. If used, the bosses project outwardly from the outside wall of the outer tubular member and are located periodically along the length of the tubing. | |
