Patent ID: 11939737
Assignee: nan
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC E  C  G | IPC C  E  G

Claim 0:
1. A composite manhole assembly, comprising:
a manhole cover having
a disc-shaped body made of a fiber-reinforced thermosetting composite, the disc-shaped body having a cavity therein adapted to receive a mass of magnetic material detectable by a metal detector;
the disc-shaped body having an edge;
the fiber-reinforced thermosetting composite comprising a resin, a fiber, and a filler, wherein the resin, the fiber and the filler account for ninety to ninety-five percent of the fiber-reinforced thermosetting composite by weight;
the fiber-reinforced thermosetting composite comprising a mold release agent, an initiator, a pigment, a thickener, a shrink control additive, and an inhibitor, wherein the mold release agent, the initiator, the pigment, the thickener, the shrink control additive, and the inhibitor account for five to ten percent of the fiber-reinforced thermosetting composite by weight;

a manhole frame being substantially ring-shaped and having an external circumference and an interior circumference, the interior circumference having a supporting edge adapted to physically couple with the edge of the disc-shaped body such that the disc-shaped body is securely nested therein; and
the manhole frame comprises a fiber reinforced thermoset polymer.