CPC Definition - Subclass H05F

Last Updated Version: 2017.05
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

H02G 13/00

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

A41D 13/008

Footwear with earthing or grounding means

A43B 7/36

Carrying off electrostatic charges from living beings

A61N 1/14

Electric elements specially adapted for carrying off electrostatic charges from vehicles

B60R 16/06

Static discharge and lightning protection for aircraft

B64D 45/02

Arrangements in large containers

B65D 90/46

Structural protection against electrostatic charges or discharges for semiconductor devices

H01L 23/60

Protective earth or shield arrangements on coupling devices

H01R 13/648

Devices providing for corona discharge

H01T 19/00

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

H05K 9/00

Informative references

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

Domestic cleaning implements functioning electrostatically

A47L 13/40

Cleaning by electrostatic means

B08B 6/00

Apparatus for electrographic processes using a charge pattern

G03G 15/00

Electrostatic machines

H02N

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

H01J 29/868

Antistatic elements in semiconductor handling

H01L 21/67396

Informative references

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

Antistatic materials

C09K 3/16

Treatment of fabrics

D06M 15/00

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

B01J 19/08

Electrostatic spraying

B05B 5/00

Purifying air by electrostatic fields

F24F 3/166

Devices providing for corona discharge

H01T 19/00

Apparatus for generating ions into the atmosphere

H01T 23/00

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

A43B 3/163

Grounding means for footwear

A43B 7/36

Rec in chairs, beds

A47C 31/004

Rec in electrotherapy

A61N 1/14

Rec in tyres

B60C 19/08

Rec in vehicles

B60R 16/06

Rec in aircrafts

B64D 45/02

Rec from sheets, webs

B65H 2301/5133

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

B67D 7/3236

Antistatic layers in flexible sheet materials

D06N 7/0042

Rec in semiconductors

H01L 23/60

Rec in electric connectors

H01R 13/6485

Rec in electronic devices

H05K 9/0067, H05K 9/0079

Informative references

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

Conductive hoses

F16L 11/127, F16L 11/1185

Use of naturally-occurring 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

A01G 15/00

Screening atmospheric or terrestrial radiations or fields

A61N 1/16

Lighter-than-air aircrafts (ex balloons)

B64B 1/50

Measurements related to lightning

G01R 29/0842

Measuring atmospheric potential differences

G01W 1/16

Installation of lightning conductors

H02G 13/00