Manhole cover

Details Manhole cover Manhole cover

1992-10-15

1995-01-03

Britts, Ramon S.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 19, E02A 2914

Patent

active

053780787

ABSTRACT:
The improved manhole cover of this invention provides a strong yet lightweight access cover structure made from a series of radially staggered ply layers bonded above and below a homogenous frusto-conical core portion with resin, each ply layer made from an array of radially staggered unidirectional fiber tape.

REFERENCES:
patent: 4662777 (1987-05-01), Newton
patent: 4726707 (1988-02-01), Newton

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