Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Surface deformation means only
Reexamination Certificate
2007-09-04
2007-09-04
Gupta, Yogendra N. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Surface deformation means only
C425S396000, C425S407000, C425S415000, C425S423000
Reexamination Certificate
active
11283690
ABSTRACT:
A consolidated cellulosic article of increased thickness and target face density, as well as an apparatus and method of manufacturing same, are disclosed. The apparatus includes first and second dies adapted to move toward one another with a mat of cellulosic material and a binding agent therebetween. When the dies move together, the mat is compressed under pressure and heat with forms on one of the dies forming indentations in the mat. Compression zones of increased density form between the indentations and a first face of the mat. By spacing the forms appropriately, the compression zones overlap, and the first face of the resulting consolidated board is provided with substantially uniform density. Since the entire board is not compressed to the same degree, its overall thickness is enhanced while the density of the first face of the mat is increased, and relatively little material is used.
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patent: 6579483 (2003-06-01), Vaders
Berenato White & Stavish
Gupta Yogendra N.
Masonite Corporation
Nguyen Thu Khanh T.
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