Pipe coupling
Patent 4260181 Issued on April 7, 1981. Estimated Expiration Date: 
August 28, 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.
August 28, 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 ReferencesInventorApplicationNo. 05/937137 filed on 08/28/1978US Classes:285/15, REPAIR138/100, BREAKJOINT138/162, Tongue and slot138/167, With diverse locking means138/168, With interlocking hooks138/169, Diversity of seam138/99, External156/308.4, Only part of contacting laminae surfaces bonded; e.g., seam, seal, etc.285/148.23, Reducer285/21.3, Having solvent facilitator285/419, Longitudinally divided285/423, Nonmetallic403/270, Fusion bond, e.g., weld, etc.403/341INTERFITTED MEMBERS WITH EXTERNAL BRIDGING PIECEExaminersPrimary: Frazier, Roy D.Assistant: Pietruszka, Carl F. Attorney, Agent or FirmInternational ClassesF16L 55/179 (20060101)F16L 55/17 (20060101) F16L 55/16 (20060101) AbstractA pipe coupling useful in plumbing systems formed of unthreaded pipes for repairing damaged portions of said systems, particularly those portions occurring immediately adjacent emplaced couplings, such as an L or T coupling. A coupling in accordance with the invention is comprised of a pair of substantially semi-cylindrical pipe sections having longitudinal edges formed so as to mate with one another to hold the sections together. The sections are sized so a first end has an internal diameter substantially equal to the external diameter of the emplaced pipe so as to fit closely therearound, whereby an adhesive applied therebetween forms a water-tight seal. A second end of the sections is enlarged so as to fit around and engage and thereby be adapted to form a water-tight seal with the external diameter of the emplaced coupling.Other References
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