Underground irrigation system
Patent 3946762 Issued on March 30, 1976. Estimated Expiration Date: 
March 30, 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.
March 30, 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 928660 1989427 3698195 3777987 3830067 3858618 InventorApplicationNo. 492963 filed on 07/29/1974US Classes:405/45, Porous138/177, STRUCTURE239/145, POROUS OR EXTERNAL WICK DISCHARGE MEANS239/542, CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR405/43, Porous or apertured pipe, flume, or tileway405/44Uniform dischargeExaminersPrimary: Queisser, Richard C.Assistant: Gorenstein, Charles Attorney, Agent or FirmAbstractAn irrigation or drainage system is provided comprising one or more conduits having radially positioned spaced apertures in the walls thereof, the system being otherwise closed except for an inlet/outlet aperture. The exterior of the conduits is covered by a snugly fitting fine mesh fabric sheath which covers all of the radial apertures, the interstices in the mesh of the fabric being very small and uniformly distributed such that fluid under slight to moderate pressure will flow through said sheath at least partially as the result of capillary action, and fluid distribution will be uniform throughout the length of the fabric sheath and about the periphery thereof. | |
