Stackable riser for on-site waste and drainage systems
Patent 5852901 Issued on December 29, 1998. Estimated Expiration Date: 
December 19, 2016. 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.
December 19, 2016. 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 ReferencesStackable riser for on-site waste and drainage systems Patent #: 5617679 InventorAssigneeApplicationNo. 769950 filed on 12/19/1996US Classes:52/20, With additional enclosure structure; e.g., manhole52/79.1, PREASSEMBLED SUBENCLOSURE OR SUBSTRUCTURE SECTION(S) OF UNIT OR BUILDING52/136, Compartmented220/4.26, Stacked or aligned similar sections405/41, Riser or standpipe outlet or intake405/136SubaqueousExaminersPrimary: Friedman, Carl D.Assistant: Edwards, W. Glenn Attorney, Agent or FirmInternational ClassE02D 029/14AbstractA plastic stackable riser for providing a grade level access for underground components such as septic tanks, distribution boxes, and drop boxes, including a cylindrical side wall having a top free edge and a bottom edge. The top free edge defines a first end opening and the second bottom edge is connected to a generally inverted U-shaped connecting member which defines a channel shaped to receive the first free edge portion of an adjacent stackable riser. In use, a plurality of stackable risers are interlocked together so that the side walls all extend along common vertical axes to the underground component and provide a gas-tight, liquid-tight column above the underground component.Field of SearchWith additional enclosure structure; e.g., manholePREASSEMBLED SUBENCLOSURE OR SUBSTRUCTURE SECTION(S) OF UNIT OR BUILDING Compartmented Subterranean enclosure with portal opening; e.g., storm or root cellar, bomb shelter WITH ENTRANCE FOR PERSONS OR OBJECTS IN HORIZONTAL OR INCLINED COVER Mausoleum type Plural covers defining a compartment therebetween Screw operated Stacked or aligned similar sections Extension Vault cover-closure Elevation or level adjustment UNDERGROUND Street, sidewalk, gutter or curb structure Subaqueous Riser or standpipe outlet or intake Porous or apertured pipe, flume, or tileway Flow control Closed channel Below bed Entrenching or burying apparatus guided by pre-positioned pipe or cable | |
