Electrically heated thermal microbial drain barrier
Patent 4192988 Issued on March 11, 1980. Estimated Expiration Date: 
July 11, 1997. 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.
July 11, 1997. 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 2085470 2452367 3050608 3105136 3126469 Drain pipe sterilization Patent #: 3985994 InventorsAssigneeApplicationNo. 05/814644 filed on 07/11/1977US Classes:219/201, Combined with diverse-type art device134/19, Including work heating or contact with combustion products138/33, Electric219/535, Specially formed or adapted to fit material to be heated (e.g., a pipe)392/480, Pipe or tube forms flow path4/222, DISINFECTION4/679, DRAIN, OVERFLOW OR TRAP FOR A SINK OR BATH422/22Using direct contact with electrical or electromagnetic radiationExaminersPrimary: Bartis, A.Attorney, Agent or FirmInternational ClassesA61L 2/04 (20060101)H05B 3/54 (20060101) H05B 3/58 (20060101) E03C 1/12 (20060101) E03C 1/126 (20060101) AbstractA microbe drain barrier for insertion in the drain of a sink or the like to prevent microorganisms from reentering the sink from the drain. The barrier includes a length of thin-walled heat-resistant, electrically non-conductive tubing having a heat conductivity in the axial direction of not more than about 3 Btu/hr/ft2 /° F./ft. The barrier includes electric heating means for heating the tubing to an inner surface temperature sufficient to prevent the growth of microbes thereon. Connector pipes extend axially outwardly from the tubing for mounting the tubing in a drain pipe such that drainage through the drain pipe is required to pass through the tubing. The connector pipes are secured to the tubing by annular insulating rings which isolate the tubing and electric heating means from the connector pipes. The low heat conductivity of the tubing reduces axial transfer of heat from the tubing to supporting drain pipe structures, and the electrically non-conductive nature of the tubing serves as an insulator to prevent the heating means from coming into electrical contact with water or other drainage fluid passing through the tubing.Other References
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