Compositions – Leather or fur treating
Reexamination Certificate
1999-06-14
2001-11-27
Gupta, Yogendra N. (Department: 1751)
Compositions
Leather or fur treating
C008S094150, C008S09419C, C428S473000, C427S389000, C427S412000, C072S343000
Reexamination Certificate
active
06322717
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a processing method of a leather material and a leather material thus processed and a leather product produced by using the leather material thus processed.
BACKGROUND OF THE INVENTION
Up to this time, various leather products such as bags or bracelets produced by using the skin of animals like cows have been known on the market. These leather products are formed in various shapes by processing leather materials by sewing, physically folding, twisting or pressing. In addition, ornamental designs are applied on the leather products by creating grains by using these methods.
However, according to these conventional methods, the shape of the grains created on the leather skin has to be limited to man-created ones and the deformation of the leather skin created by these method is not permanent. Therefore, the ornamental effect which can be achieved by these conventional methods is limited.
Further, since it has not been possible to create a large convexity by performing a permanent deformation processing to the leather skin, the effect of creating concavity-convexity shapes to the leather skin to create an ornamental design is also limited.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a processing method of a leather material and provide a leather material thus processed as well as a leather product produced by using the leather material thus processed by creating permanent grains in various natural shapes on the leather materials to achieve an ornamental effect which has never been achieved so far.
In order to achieve the above object, the present invention provides a processing method of a leather material comprising:
a first step of sammying a tanned leather material;
a second step of moistening the leather material; and
third step of partially heating the leather material from the back thereof
According to the processing method of the present invention, grains are created on the surface of the leather material in the third step by partially heating the back of the leather material which has already undergone the first and the second processing step of the present invention. The deformation of the leather material by the grains thus created is permanent and the shape of the leather material thus formed can be maintained semi-permanently without applying any physical force.
The term “surface of the leather material” herein used means the outer surface of the membrane covering the outside body of the animal from which the leather material is obtained. The term “back of the leather material” herein used means the opposite side of the “surface of the leather material”.
In addition, since the grains created on the leather material by the third step of the present invention is formed in a natural, not man-created, shape by a permanent deformation processing, any other special processing for physically creating grains on the surface of the leather material is unnecessary and a novel ornamental effect can be achieved.
Further, by creating permanent grains on the surface of the leather material, the leather material may be folded at the positions where the grains are created. Therefore, a relatively large convexity may be freely formed on the leather material.
In the above processing method, at least one of the length (width), pitch, depth and direction of the grains may be changed by changing at least one of the following: a position of leather material; thickness of the leather material; the method of moistening the leather material in the second step; the area of heating in the third step; heating temperature in the third step; and a heating time period in the third step.
By making these changes, various grains having different sizes and shapes are created on the leather material. By changing the grains into various shapes, the ornamental effect may be optionally changed accordingly. “The portion of the leather” herein used means the portion of the skin of the animal from which the leather material to be used is obtained, such as abdomen, back, leg and the like. The moistening of the leather material may be performed by dipping the leather material in water, spraying water to the leather material or applying water by a brush. As the leather material of the present invention, any skins of animals including, but not limited to, cows, pigs, sheep and crocodiles may be used.
One embodiment of the leather material processed according to the present invention comprises grains created thereon by heating the leather material from the back thereof Because the grains on the leather material created by the method of the present invention is permanently formed in a natural, not man-created, shape, a novel ornamental effect which has never been achieved in the processing of leather materials so far may be achieved.
Another embodiment of the leather material processed according to the present invention further comprises a convexity formed by folding the leather material at the position where the permanent grains are created by using the processing method of the present invention.
According to this embodiment, a relatively large convexity are freely formed by the leather material by folding the same at the position where the grains are created in a manner that the surface of the leather material being the top of the convexity thus formed.
By creating a convexity to the leather material according to this method, a novel ornamental effect is achieved by the processing of leather materials. Also, it becomes possible to produce artistic handicrafts by using leather materials by freely forming concavities-convexities thereon.
Further, according to the leather product produced according to the present invention, because of the existence of the grains permanently formed in a natural, not man-created, shape or the relatively large convexity, a novel ornamental effect may be achieved in the leather products thereby enhancing the value of those leather products.
REFERENCES:
patent: 6022838 (2000-02-01), Kuwabara et al.
patent: 6133372 (2000-10-01), Lohmnn et al.
Gupta Yogendra N.
Hamlin Derrick G.
Rosenthal & Osha L.L.P.
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