Patent · US Active

Manhole cover device

US8118517B2 · kind B2 · utility

18Cited by

17References

20Claims

0Family size

Inventors

John J. Kelley, III · Glen Rock, US
David Elder · Inverness, GB

Key dates

Filing date	Mar 10, 2010
Grant date	Feb 21, 2012
Priority date	—
Expiry date	Apr 9, 2030

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE02D29/14
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rubber manhole cover, suitable for attaching to a top of a metal manhole lid, includes at least two bonded layers of rubber material of differing properties, including a bottom layer of a first rubber material, and a top layer of vulcanized rubber material, the top and bottom layers functioning as a single unit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.