Aeration tubing system
Patent 3988396 Issued on October 26, 1976. Estimated Expiration Date: 
October 26, 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.
October 26, 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 2771320 2814529 3186644 3293861 3525685 3677936 3698195 3736755 InventorApplicationNo. 587207 filed on 06/16/1975US Classes:261/124, Multiple jet239/533.13, Resilient or deformable terminal outlet241/186.35Endless loop feed or discharge conveyorExaminersPrimary: Miles, Tim R.Attorney, Agent or FirmAbstractAn aeration system comprising a long resilient plastic tube having a plurality of aeration slit valves therein, a control means connected about the outside of said tube to control the size of the aeration slit valve openings when the tubing is under pressure, and a second tube encompassing the first tube and the control means. The second tube also includes a plurality of slit or perforated type openings therein. Said aeration system providing a non-floating, weighted aeration system having a controlled aeration flow of air out through the slits in said tubing system along length of system and may include a smooth outer diameter surface to prevent material from snagging on said tubing system when placed in a sewage system. | |
