US 11,939,737 B2
Composite manhole cover with embedded detection
William C. Nunnery, Mission, TX (US)
Filed by Composite Access Products GP, LLC, McAllen, TX (US)
Filed on Dec. 13, 2022, as Appl. No. 18/080,735.
Application 18/080,735 is a continuation of application No. 16/542,974, filed on Aug. 16, 2019, granted, now 11,525,235.
Application 16/542,974 is a continuation in part of application No. 16/047,104, filed on Jul. 27, 2018, abandoned.
Application 16/047,104 is a continuation in part of application No. 15/820,595, filed on Nov. 22, 2017, abandoned.
Claims priority of provisional application 62/432,941, filed on Dec. 12, 2016.
Prior Publication US 2023/0113134 A1, Apr. 13, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. E02D 29/14 (2006.01); C08K 3/08 (2006.01); G01D 11/24 (2006.01); G06K 19/07 (2006.01)
CPC E02D 29/14 (2013.01) [C08K 3/08 (2013.01); G06K 19/0723 (2013.01); C08K 2003/0856 (2013.01); E02D 2300/0017 (2013.01); E02D 2300/0045 (2013.01); E02D 2300/007 (2013.01); E02D 2600/10 (2013.01); G01D 11/245 (2013.01)] 16 Claims
OG exemplary drawing
 
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.