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US 6,596,784 B1Granted
Strengthened thermoplastic for window coverings
AssigneeNien Made Enterprise Co., Ltd.
InventorGordon King
Life of this patent
Estimating the term…
Abstract
A thermoplastic window covering article, and the method for making the same. The window covering article is formed of a closed cell foam of a thermoplastic strengthened with diatomaceous earth having less than about two percent moisture.
Claims40
An extruded window covering article comprising a closed cell foam of a first thermoplastic, containing between about 1% and 40% of powdered diatomaceous earth by weight, the extruded article being formed with diatomaceous earth containing no more than about 2% by weight of moisture.
A method for preparing a thermoplastic window covering product comprising the steps of:
- (a) mixing a first thermoplastic material with powdered diatomaceous earth, so that the diatomaceous earth content is between about 1% and about 40% by weight, and said diatomaceous earth containing no more than about 2% by weight of moisture;
- and
- (b) extruding the resulting mixture to form a thermoplastic closed cell foam with at least a 50% volume expansion of the thermoplastic, to form the product.
Dependencies are inferred from the claim text.