초록 ▼

A protective mat for the pavement area surrounding an open manhole comprises a bottom layer of petroleum and contamination impervious preferably polyethylene sheet material laminated to an upper fibrous mat sheet layer preferably comprising cotton fibers bonded together to form a porous liquid absor

A protective mat for the pavement area surrounding an open manhole comprises a bottom layer of petroleum and contamination impervious preferably polyethylene sheet material laminated to an upper fibrous mat sheet layer preferably comprising cotton fibers bonded together to form a porous liquid absorbent layer.

대표청구항 ▼

1. A contaminant protective apron pad for use with a manhole in a pavement comprising:a first bottom layer for overlying and contacting said pavement and having an open central region for overlying said manhole so that the bottom layer extends about the manhole; and a second top layer secured to and

1. A contaminant protective apron pad for use with a manhole in a pavement comprising:a first bottom layer for overlying and contacting said pavement and having an open central region for overlying said manhole so that the bottom layer extends about the manhole; and a second top layer secured to and overlying the first bottom layer and extending about the manhole, the second top layer comprising absorbent material for absorbing liquids and for receiving and retaining contaminants contacting said second top layer.