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US 2009/0214292 A1Published application
Encapsulated manhole cover
OwnerJohn Crissman, Danny Sidersinventors
Life of this patent
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Abstract
Embodiments of the present invention relate to a cover for a manhole or similar structure that encapsulates a traditional cover so as to extend the height of the cover. Generally, a conventional manhole cover is partially or entirely encapsulated in polyurethane to change its outside dimensions to match the environment of an intended location.
Claims24
An encapsulated manhole cover comprising:
- an upper region made of a first material;
- a substrate, having one or more through-holes, made of a second material;
- and
- a respective extension region located within at least some of the one or more through-holes and made of the first material and integrally formed with the upper region;
- wherein the upper region and the respective extension region encapsulate at least a portion of the substrate.
2 more elements
A method of making an encapsulated manhole cover comprising the steps of:
- creating a mold comprising:
- a top region adjacent a top of a substrate having one or more through-holes;
- curing polyurethane within the mold so as to encapsulate at least the top of the substrate such that a respective extension region of polyurethane extends at least partially into at least some of the one or more through-holes.
An encapsulated manhole cover comprising:
- a substrate having a plurality of through-holes;
- and
- an encapsulating layer surrounding at least a top surface of the substrate and at least partially filling at least some of the through-holes.
Dependencies are inferred from the claim text.