Cooperative Patent Classification

CPC Definition - Subclass H05F

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Last Updated Version: 2016.11
STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY (electrostatic machines H02N; uses of electricity in performing operations, e.g. precipitation, see the relevant subclasses for the operations)
Definition statement

This place covers:

Means for preventing the formation of or removal of electrostatic charges in general, not otherwise provided for.

Using naturally-occurring electricity (e.g. lightning)

Relationships with other classification places

As more and more the protection from and the removal of electrostatic charges have become critical in many systems and devices, subclasses have been created in many areas incorporating the scope of H05F, rendering this subclass the last appropriate place for classification.

Spark gaps, sparking plugs and corona discharge devices are classified in subclass H01T.

Electrostatic machines are classified in H02N.

References
Limiting references

This place does not cover:

Installations of lightning conductors; Fastening thereof to supporting structure

Specific applications of methods or arrangements for preventing the formation of static electricity or for carrying off these charges after their formation. For example:

Garments protecting against electric shocks or static electricity

Footwear with earthing or grounding means

Carrying off electrostatic charges from living beings

Electric elements specially adapted for carrying off electrostatic charges from vehicles

Static discharge and lightning protection for aircraft

Arrangements in large containers

Structural protection against electrostatic charges or discharges for semiconductor devices

Protective earth or shield arrangements on coupling devices

Devices providing for corona discharge

Screening of printed circuits or components thereof against electric or magnetic fields

Informative references

Attention is drawn to the following places, which may be of interest for search:

Domestic cleaning implements functioning electrostatically

Cleaning by electrostatic means

Apparatus for electrographic processes using a charge pattern

Electrostatic machines

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Corona discharge or brush discharge

Discharge from a conductor when the potential difference between it and its surroundings exceeds a certain value but is not enough to cause a spark or an arc.

Spark gaps

Enclosed or non-enclosed discharge devices having cold electrodes and used exclusively to discharge a quantity of electrical energy in small time duration.

Coupling devices

Devices having two or more parts specially adapted so as to be capable of ready and repeated physical engagement or disengagement, without the use of a tool for the purpose or establishing or breaking an electrical path.

Electrostatic charge

They are used as synonyms for the electric charge at rest on the surface of an insulator or insulated body.

Preventing the formation of electrostatic charges
Definition statement

This place covers:

Means that prevent or suppress electrostatic charge build-up.

References
Limiting references

This place does not cover:

Antistatic coating in cathode/electron tubes

Antistatic elements in semiconductor handling

Informative references

Attention is drawn to the following places, which may be of interest for search:

Antistatic materials

Treatment of fabrics

Carrying-off electrostatic charges ({from shoes A43B 7/36}; from living beings A61N 1/14; {from tyres B60C 19/08; from vehicles B60R 16/06; from aircraft B64D 45/02; from large containers B65D 90/46})
Definition statement

This place covers:

Residual main group for removing electrostatic charges not provided elsewhere.

References
Limiting references

This place does not cover:

Chemical processes involving electrical discharges

Electrostatic spraying

Purifying air by electrostatic fields

Devices providing for corona discharge

Apparatus for generating ions into the atmosphere

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

(removal of or protection from electrostatic charge, rec)

Rec in footwear

Grounding means for footwear

Rec in chairs, beds

Rec in electrotherapy

Rec in tyres

Rec in vehicles

Rec in aircrafts

Rec from sheets, webs

Rec in transfer of liquids from bulk storage into vehicles or smaller containers

Antistatic layers in flexible sheet materials

Rec in semiconductors

Rec in electric connectors

Rec in electronic devices

Informative references

Attention is drawn to the following places, which may be of interest for search:

Conductive hoses

Use of naturally-occuring electricity, {e.g. lightning or static electricity}
Definition statement

This place covers:

Recovery and use of naturally-occurring electricity or electrostatic charge, ex., lightning.

Relationships with other classification places

When the subject matter is the machine (normally a generator) that receives natural electrostatic charge and produces electric energy, H02N 1/00 or H02N 11/00 are relevant.

References
Limiting references

This place does not cover:

Devices or methods for influencing weather

Screening atmospheric or terrestrial radiations or fields

Lighter-than-air aircrafts (ex balloons)

Measurements related to lightning

Measuring atmospheric potential differences

Installation of lightning conductors