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CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING (dyeing and bleaching of leather or furs D06)
Definition statement
This subclass/group covers:

Preparatory steps prior to tanning.

Chemical aspects of tanning (chemical compounds).

Impregnation of leather.

Coating of leather with polymers.

Devices such as drums for the chemical treatment of hides, skins or leather.

References relevant to classification in this subclass
This subclass/group does not cover:
Gelatine for foodstuff
Layered products next to a fibrous layer
Peptides or collagen
Macromolecular products derived from leather
Polishing compositions
Preparation of glue or gelatine from leather scrap
Enzymes and Compositions thereof
Mechanical treatment or processing of skins, hides or leather
Artificial leather
Dyeing of leather
Informative references
Attention is drawn to the following places, which may be of interest for search:
Application of coating compositions onto the leather when surface-finishing of the leather
Polyurea or polyurethane coatings
Special rules of classification within this subclass

For the chemical treatment of hides, skins or leather several main group or subgroup classes can be given, if considered useful for search matters. Primarily the subject-matter disclosed in the examples of a patent document is to classified.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Liming
Treatment of hides or skins with lime solution or other alkalis e.g. caustic soda to destroy the hair or wool, remove proteins and fat
Pelt
Hide or skin in the dehaired or dewooled, limed, fleshed, perhaps bated (delimed) and scudded condition; Ready for tanning
Raw hide
Product made from bovine hides, freed from the hair and the flesh layer and dried out in the limed state
Suede
Leather with a velvet-like surface
Wet-blue
Hide or skin, subjected to the usual beamhouse processes, chrome-tanned and left wet
Synonyms and Keywords

In patent documents the following abbreviations are often used:

BOD
Biological oxygen demand
THP
Tetrakis(hydroxymethyl)phosphonium

In patent documents the following words "drum", "vessel" and "vat" are often used as synonyms.

Chemical treatment prior to tanning
Tanning; Compositions for tanning
Degreasing leather
Pasting processes (chemical part)
Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
Surface finishing of leather
Definition statement
This subclass/group covers:

The application of coating compositions onto the leather.

Special rules of classification within this group

C14C 11/006 mainly covers the formation of polyurea or polyurethane coatings. Therefore, classification is also made in in groups C09D 175/02 and C09D 175/04.

Manufacture of special kinds or leather, e.g. vellum (chamois tanning C14C 3/14 )
Apparatus for chemical treatment or washing of hides, skins, or leather
Subject matter not provided for in other groups of this subclass
This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013