04592674 is referenced by 22 patents and cites 11 patents.

A manhole barrel is cast with an annular gasket in place in the barrel form. The form has a frusto-conical pallet section grooved for receiving the gasket. Anchors protruding from the gasket become embedded in concrete when the latter is introduced into the form.

Title
Concrete manhole
Application Number
5/889195
Publication Number
4592674
Application Date
March 23, 1978
Publication Date
June 3, 1986
Inventor
Michael G Baliva
161 Sunset St., Rochester, 14606
NY, US
Agent
Joseph C MacKenzie
IPC
E02D 29/11
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