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Class Information
Number: 137/584
Name: Fluid handling > Systems > System with plural openings, one a gas vent or access opening > Access and outlet
Description: Systems in which one of the openings is an access opening and another is an outlet for fluid contents of the system.

Sub-classes under this class:

Class Number Class Name Patents
137/585 Tank access opening and bottom outlet 15

Patents under this class:

Patent Number Title Of Patent Date Issued
8616074 In-line piggable wye fitting, apparatus and method Dec. 31, 2013
8608021 Road tanker fluid storage tank fill cover assembly Dec. 17, 2013
8418718 Double walled tanks with internal containment chambers Apr. 16, 2013
8397746 System for harvesting rainwater Mar. 19, 2013
7926510 Risers for use with access openings in wastewater treatment tanks Apr. 19, 2011
5971014 Vacuum breaker valve vent fitting clean-out device Oct. 26, 1999
5421474 Device for the assembly by clamping of an elastically compressible part Jun. 6, 1995
5199645 Sprinkler system conversion kit Apr. 6, 1993
5144699 Plumbing drainage system Sep. 8, 1992
5131432 Dishwasher with discharge pump and nonreturn valve Jul. 21, 1992
5080122 Non-return valve Jan. 14, 1992
5004005 Combination valve Apr. 2, 1991
4928725 Combination plug and two-way check valve May. 29, 1990
4917147 Backwater escape valve Apr. 17, 1990
RE32870 Sewer relief valve Feb. 21, 1989
4739796 Fluid flow diverter Apr. 26, 1988
4709723 Septic tank for alternative sewer systems Dec. 1, 1987
4585052 Tank apparatus for holding a reserve supply of coolant for a radiator on a vehicle Apr. 29, 1986
4475571 Sewer relief valve Oct. 9, 1984
4420010 In-line back flow preventer Dec. 13, 1983
4408628 System and method for repair of leaking storage tanks containing fluids which contaminate ground water Oct. 11, 1983
4377181 High temperature dual butterfly valve Mar. 22, 1983
4372527 Blowout preventer Feb. 8, 1983
4321942 Backflow preventer valve Mar. 30, 1982
4273152 Control valve assembly with onstream seal removal feature Jun. 16, 1981
4245668 Pressure regulator Jan. 20, 1981
4140149 Plug cock Feb. 20, 1979
4032106 Self-sealing valve Jun. 28, 1977
4015953 Firecheck Apr. 5, 1977

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