CPC Definition - Subclass C10C
This place covers:
Working-up, e.g.processing, of tar, pitch, asphalt or bitumen, including use of techniques such as distillation, heat-treatment, water removal or extraction with selective solvents.
Working up implies improvement of the material.
Production of pyroligneous acid.
This application related subclass covers techniques specially adapted to working up of tar, pitch, asphalt or bitumen, or the production of pyroligneous acid, even though some of the techniques per se are covered by subclasses such as C10B, C10G. For example, coking bitumen, tar or the like is covered by C10B 55/00
This place does not cover:
Attention is drawn to the following places, which may be of interest for search:
Shaped ceramic products containing a carbonisable binder
Compositions of bituminous materials
Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch
Obtaining natural resins or turpentine
Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
Anodes for electrolytic production of aluminium
Making carbon filaments by decomposition of organic filaments
Machines for road construction or repair
In the absence of an indication to the contrary, classification is made in the last appropriate place ("last place rule").
The main group C10C 1/00 only covers working-up coal tar.
Working-up petroleum (oil) tar is covered by C10C 3/00.
In this place, the following terms or expressions are used with the meaning indicated:
Tar is a black thermoplastic material produced by the destructive distillation of coal – sometimes referred to as coal tar. Is also a residue in the manufacture of coal gas and coke. May also be derived from plants such as pine trees.
Pitch is the name of a large number of highly viscous liquids which appear solid. Pitch may be made from petroleum or plant sources. Petroleum derived pitch is also known as bitumen whereas plant derived pitch is known as resin. Pitch derived from plant resin however is known as rosin.Tar and pitch are often used interchangeably. However, pitch is considered to be more solid whilst tar is considered to be more liquid.
Asphalt is a sticky, black and highly viscous liquid or semi solid that is present in crude petroleum and in some natural deposits sometimes termed asphaltum. In US terminology asphalt (or asphalt cement) is the carefully refined residue from the distillation process of selected crude oils. Outside of the US, the product is called bitumen.
Bitumen is a mixture of organic liquids that are highly viscous, black, sticky, entirely soluble in carbon disulfide and composed primarily of highly condensed polycyclic aromatic hydrocarbons.
Pyroligneous acid, also called wood vinegar, is a dark liquid produced by the destructive distillation of wood. Its principal components are acetic acid and methanol. It was once used as a commercial source for acetic acid.
In patent documents, the word/expression in the first column is often used instead of the word/expression in the second column, which is used in the classification scheme of this place:
"wood vinegar", "pyrolysis oil" and "bio-oil"
This place covers:
- Production of pyroligneous acid
- Distillation or destructive distillation of wood resulting in charcoal and liquid condensates
Carbonisation of wood resulting in charcoal, main product and volatile constituents being not recovered is classified in C10B