Liquid infiltration prevention structures for preventing liquid infiltration manhole assemblies gate value sealing structures for preventing settling or shifting of key box bonnets and method for using said structures

  • US 6,226,929 B1
  • Filed: 12/08/1999
  • Issued: 05/08/2001
  • Est. Priority Date: 10/31/1995
  • Status: Expired due to Term
First Claim
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1. A liquid infiltration adapting structure for preventing liquid infiltration, the liquid infiltration adapting structure comprising:

  • a ring structure having at least one opening, a first side, a second side, an inner margin surface, and an outer margin surface;

    at least one rectangular positioning structure coupled to said first side of said ring;

    said outer margin surface includes a margin area and said at least one structure is positioned on said first side and is entirely upstanding relative to said first side and is spatially oriented so that a predetermined portion of at least one said structure extends past said margin area.

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