Skip over navigation
MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL
Relationship between large subject matter areas

C03B concerns all aspects of glass manufacture processes, apparatus and C03C relates to the glass chemistry, such as composition, additives, chemical treatment.

C04B relates to ceramics having a crystallographic structure different from the glass compounds. For composites containing glass and ceramic, composites comprising more than 50% of glass are classified in C03C.

References relevant to classification in this subclass
This subclass/group does not cover:
Beads composition
Changing the surface of the glass ribbon by chemical methods
Chemical aspects of glass
Chemical aspects of hollow, porous, sintered or foamed beads
Coating of the fibre during the drawing process
Cutting or severing of light guides
Fusion-splicing of light guides
Optical fibres per se with polarisation maintaining properties in light guides
Preparation of finely divided silica
Refining agents
Surface treatment of fibres or filaments from glass, minerals or wools, sizing of the fibres
Surface treatment of glass by coating with glass
Treatment of light guides to shape optical elements
Informative references
Attention is drawn to the following places, which may be of interest for search:
Apparatus specially adapted for the manufacture of electric discharge tubes, discharge lamps
Bi-component fibres
Brick shapes in general
Building elements of glass or other transparent material
Containers or dishes for laboratory use, e.g. laboratory glassware
Conveying systems for fragile sheets, e.g. glass
Crucibles for supporting the melt
Devices for reactant delivery in general
Disposal or transformation of solid waste in general
Doors, windows
E06
Extrusion presses in general
Glass containers, e.g. bottles, ampoules, jars
Globes, bowls, cover glasses
Hand tools for cutting ampoules
Machines or processes for grinding or polishing glass
Molding plastics around a core using a cross-head annular extrusion nozzle
Non-woven fabrics
Nozzles
Optical glass, lens
Programme-control system
Syringes
Thermal insulation arrangements using fillers, e.g. slag wool
Treatment of radioactive waste
Windows, doors for airplanes
Windows, windscreens for vehicles
Woven fabrics
Yarns or threads made from glass
Special rules of classification within this subclass

The IPC group C03B8/00 is not used in CPC. Depending on the process used, production of glass may be classified in the following CPC groups:

C03B8/00 is classified in C03B 19/00, C03B 37/00

C03B8/02 is classified in C03B19/1065, C03B 19/12, C03B37/011, C03B 37/016

C03B8/04 is classified in C03B19/106, C03B 19/14, C03B 37/014

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Annealing
Process of slowly cooling glass to relieve internal stresses after it was formed
Cullet
Scraps of broken or waste glass for remelting
Debiteuse
Clay block floating upon molten glass in a tank furnace and containing a long slot that shapes glass into a sheet as it is drawn through it
Gob
Lump of molten glass used to make a piece of glassware
Mineral wool
Inorganic fibrous material made from molten glass
Slag wool
Mineral wool made from blast-furnace slag
Tempering
Process of heating glass above its annealing point and then rapidly cooling it.
Synonyms and Keywords

In patent documents the following abbreviations are often used:

Mineral wool, slag wool
Rock wool
Tempered
Toughened
Preparing the batches (chemical compositions C03C)
Defintion statement
This subclass/group covers:

This group covers

preparation of raw mixtures used in manufacturing glass, mineral or slag wool (batches) , e.g. mixing, pelletizing

Relationship between large subject matter areas

The chemical composition of the batch is classed in C03C 1/00.

References relevant to classification in this group
This subclass/group does not cover:
Chemical compositions
Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
Informative references
Attention is drawn to the following places, which may be of interest for search:
Burners
Electrical heating
Furnaces
F27
Mixing
Special rules of classification within this group

Heating processes to be classified in C03B 2211/00

Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
Definition statement
This subclass/group covers:

The group covers:

- Means for taking off charges of molten glass

- Forehearths, i.e. feeder channels

- Feeder spouts, e.g. gob feeders, pneumatic feeders, spout blocks

- Suction, scoop feeders

Blowing glass; Production of hollow glass articles
Definition statement
This subclass/group covers:

this group covers

Shaping of glass by blowing processes with production of hollow glass articles :

- with blow pipes, in gob feeder machines, in I.S. machines, past mould machines, moulds, blow heads

Informative references
Attention is drawn to the following places, which may be of interest for search:
Control systems
Valves
Pressing [N: molten] glass [N: or performed glass reheated to equivalent low viscosity without blowing (shaping molten glass by a press-blow process C03B 9/00, e.g. C03B 9/193; re-forming shaped glass C03B 23/00; re-heating the performed glass C03B 29/00; transporting the performed or pressed glass during its manufacture C03B 35/00)]
References relevant to classification in this group
This subclass/group does not cover:
Shaping molten glass by a press-blow process
Re-forming shaped glass
Re-heating the preformed glass
Transporting the preformed or pressed glass during its manufacture
Relationship between large subject matter areas

Material and mould characteristics to be also classed in C03B 2215/00

Rolling molten glass, i.e. where the molten glass is shaped by rolling (re-forming shaped glass by rolling C03B23/004, C03B 23/033, C03B 23/055)
Definition statement
This subclass/group covers:

This group covers

Rolling of profiled glass articles, patterned and non-patterned sheets, corrugated sheets

Construction of glass rollers

Auxiliary means for rolling glass, e.g gripping devices, sheet supports, roller beds for the rolled plate glass

References relevant to classification in this group
This subclass/group does not cover:

This group does not cover

re-forming shaped glass by rolling
Drawing glass upwardly from the melt
Definition statement
This subclass/group covers:

Drawing glass upwardly from the melt processes with production of drawing glass sheets, tubes, cylinders

Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing lips
Definition statement
This subclass/group covers:

This groups covers

Forming glass processes by flowing out with formation of glass coated with coloured layers, formation of tubes, glass sheets

Shaping glass in contact with the surface of a liquid
Definition statement
This subclass/group covers:

This group covers

Shaping glass processes in contact with the surface of a liquid, i.e. float bath, with formation of sheets

Other methods of shaping glass (manufacture or treatment of flakes, fibres or filaments from softened glass, minerals or slags C03B 37/00)
References relevant to classification in this group
This subclass/group does not cover:
Crucibles for supporting the melt in single-crystal growth by pulling form a melt; crucibles for the production of after treatment of single crystals
C30B 15/10, C30B35/002
Manufacture or treatment of flakes, fibres or filaments from softened glass, minerals or slags
Informative references
Attention is drawn to the following places, which may be of interest for search:
Carbon electrodes
Mold made of carbon ceramic
Special rules of classification within this group

Glass characteristics to be also classed in C03B 2201/00

Glass deposition burners to be also classed in C03B20700

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Liquid phase reaction
Sol-gel process
Processes specially adapted for the production of quartz or fused silica articles not otherwise provided for C03B 19/01, C01B19/066, C03B19/106, C03B 19/12, C03B 19/14, C03B 37/00 take precedence
References relevant to classification in this group
This subclass/group does not cover:
Shaping glass by progressive fusion of powdered glass
C03B19/066
Shaping glass by sintering for the production of quartz or fused silica articles
C03B19/106
Forming solid beads by chemical vapour deposition
Shaping glass by liquid-phase reaction
Shaping glass by gas or vapour phase reaction processes
Manufacture or treatment of flakes, fibres or filaments from softened glass, minerals or slags
Severing glass sheets, tubes or rods while still plastic
Definition statement
This subclass/group covers:

The cutting, the punching out, the burning-off, of glass which is in a plastic state, meaning its temperature is around softening point. There is no material ablation

Re-forming shaped glass (re-forming fibres or filaments C03B 37/14)
Definition statement
This subclass/group covers:

The re-forming of shaped glass which has already been formed such as by pressing, centrifuging, rolling, bending, blowing, etc.

References relevant to classification in this group
This subclass/group does not cover:
Re-forming fibres or filaments
Uniting glass pieces with the addition of material
Special rules of classification within this group

C03B 23/20 only concerns uniting glass without any material addition and/or reshaping.

Fabrics, felts or loose covers for preventing direct contact between the hot glass and means used to shape it are classed in C03B 40/005

Details of transporting means are also classified in C03B 2225/00

Annealing glass products
Definition statement
This subclass/group covers:

This group covers

The annealing of glass products in discontinuous or continuous way

Tempering or quenching glass products
Definition statement
This subclass/group covers:

This group covers

Tempering by using heat of sublimation of solid particles, by heat treatment, by absorbing heat radiated from the glass product, using liquid or gas

Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
Definition statement
This subclass/group covers:

Glass heating furnaces for reheating glass products in a discontinuous way or continuous way for softening or fusing their surfaces; for fire-polishing

References relevant to classification in this group
This subclass/group does not cover:
Furnaces
F27
Manufacture of rippled or crackled glass
Thermal after-treatment of glass products not provided for in groups C03B 19/00, C03B 25/00 to C03B 31/00 or C03B 37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
References relevant to classification in this group
This subclass/group does not cover:
Methods of shaping glass
Annealing glass products
Tempering or quenching glass products
Reheating glass products for softening or fusing their surface
Manufacture of rippled or crackled glass
Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals or slags
Severing cooled glass (severing glass fibres C03B 37/16)
Definition statement
This subclass/group covers:

The "traditional" cutting of glass, meaning "without ablation of material"

Relationship between large subject matter areas

Making a hole in cold glass sheet with material ablation is classified in B62D

Punching, embossing, making hole while glass is in plastic state ("hot" glass) with no material ablation is classified in C03B 21/00

References relevant to classification in this group
This subclass/group does not cover:
Boring of glass
Sawing glass (e.g. cutting glass by ablation)
Severing glass fibres
Transporting of glass products during their manufacture, [N: e.g. hot glass lenses, prisms] (conveying systems for fragile sheets, e.g. glass B65G 49/06)
Definition statement
This subclass/group covers:

The transport of glass during its manufacture (C03B processes), meaning that the glass is hot.

References relevant to classification in this group
This subclass/group does not cover:
Conveying systems for transport of cold glass sheets e.g. glass
Special rules of classification within this group

Details of transporting means are also classified in C03B 2225/00

Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
Definition statement
This subclass/group covers:

This group covers

- Manufacture of flakes

- Manufacture of glass fibres or filaments by e.g. manufacture of preforms for drawing fibres or filaments, by drawing or extruding, by using centrifugal force, by blasting molten glass

Special rules of classification within this group

Material characteristics to be also classed in C03B 2201/00

Fibre characteristics to be also classed in C03B 2203/00

Deposition burners to be also classed in C03B 2207/00

Fibre drawing characteristics to be also classed in C03B 2205/00

Preventing adhesion between glass and glass or between glass and the means used to shape it, [N: hold it or support it] [C1008]
Special rules of classification within this group

This group is only used if not already in C03B

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