Skip over navigation
Printable version [PDF]
CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING (bleaching of leather or furs D06L; dyeing of leather or furs D06P)
Definition statement
This subclass 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 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, 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.

Surface finishing of leather
Definition statement
This 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.

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013