The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 1980
Filed:
Sep. 29, 1978
Stephen Sichak, Dolton, IL (US);
Scholl, Inc., Chicago, IL (US);
Abstract
A laminar insole for footwear has a top, porous, non-woven, non-absorbent layer or mat of plastics material fibers, an intermediate moisture absorbing paper or other non-woven layer impregnated with deodorizing material, such as activated charcoal, coated on the paper fibers, and a bottom open-cell plastics foam cushion layer cured in-situ on the intermediate paper layer. The top and intermediate layers are stitch bonded together by pushing fibers from the top layer into and through the intermediate layer which also form anchors for the bottom layer. No added adhesives are needed to unite the layers. A myriad of holes are punched through all of the layers exposing the deodorizing chemical in the paper layer to air that is pumped through the insole as the foam layer is compressed and expanded upon application and release of foot load on the insole as in walking. The non-absorbent fibers of the top layer present a smooth and slippery top surface even under excessive moisture conditions while the bottom surface of the foam layer grips the shoe liner. The strength of the paper layer may be increased by coating the foam layer receiving face with a sizing material which is perforated during the stitch bonding operation.