| H | SK | ELECTRICITY |
| H01 | KL | BASIC ELECTRIC ELEMENTS |
| H01T | UKL | SPARK GAPS; OTHER NON-ENCLOSED-DISCHARGE APPARATUS (working metal by arc discharge B23, particularly B23P 1/00; arc lamps H05B 31/00) |
| H01T 1/00 | HGR | Details of spark gaps |
| H01T 1/02 | UGR1 | | . | Means for extinguishing arc |
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| H01T 1/04 | UGR2 | | . . | using magnetic blow-out |
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| H01T 1/06 | UGR3 | | . . . | with permanent magnet |
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| H01T 1/08 | UGR2 | | . . | using flow of arc-extinguishing fluid |
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| H01T 1/10 | UGR3 | | . . . | with extinguishing fluid evolved from solid material by heat of arc |
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| H01T 1/12 | UGR1 | | . | Means structurally associated with spark gap for recording operation thereof |
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| H01T 1/14 | UGR1 | | . | Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure (H01T 1/16, H01T 1/18 take precedence) |
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| H01T 1/16 | UGR1 | | . | Series resistor structurally associated with spark gap |
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| H01T 1/18 | UGR1 | | . | Electrolytic device structurally associated with spark gap |
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| H01T 1/20 | UGR1 | | . | Means for starting arc or facilitating ignition of spark gap |
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| H01T 3/00 | HGR | Spark gaps having a single gap or having a plurality of gaps in parallel, e.g. spark gap arrester (sparking plugs H01T 13/00) |
| H01T 5/00 | HGR | Spark gaps having a plurality of gaps arranged in series, e.g. spark gap arrester |
| H01T 5/02 | UGR1 | | . | Arrangements for reducing height of stacked spark gaps |
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| H01T 5/04 | UGR1 | | . | Arrangements for improving potential distribution |
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| H01T 7/00 | HGR | Rotary spark gaps, i.e. devices having one or more rotating electrodes |
| H01T 9/00 | HGR | Spark gaps specially adapted for generating oscillations |
| H01T 11/00 | HGR | Spark gaps specially adapted as rectifiers |
| H01T 13/00 | HGR | Sparking plugs |
| H01T 13/02 | UGR1 | |
| H01T 13/04 | UGR2 | | . . | Means providing electrical connection to sparking plug (electric connections in general H01R) |
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| H01T 13/06 | UGR2 | | . . | Covers forming a part of the plug and protecting it against adverse environment |
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| H01T 13/08 | UGR2 | | . . | Mounting, fixing, or sealing of sparking plugs, e.g. in combustion chamber |
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| H01T 13/10 | UGR3 | | . . . | by bayonet-type connection |
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| H01T 13/12 | UGR2 | | . . | Means on sparking plugs for facilitating engagement by tool or by hand |
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| H01T 13/14 | UGR2 | | . . | Means for self-cleaning |
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| H01T 13/16 | UGR2 | | . . | Means for dissipating heat |
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| H01T 13/18 | UGR2 | | . . | Means for heating, e.g. for drying |
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| H01T 13/20 | UGR1 | | . | characterised by features of the electrodes or insulation |
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| H01T 13/22 | UGR2 | | . . | having two or more electrodes embedded in insulation (for two or more sparks H01T 13/46) |
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| H01T 13/24 | UGR2 | | . . | having movable electrodes (H01T 13/28 takes precedence) |
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| H01T 13/26 | UGR3 | | . . . | for adjusting spark gap otherwise than by bending of electrode |
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| H01T 13/28 | UGR2 | | . . | having spherically shaped electrodes, e.g. ball-shaped |
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| H01T 13/30 | UGR3 | | . . . | mounted so as to permit free movement |
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| H01T 13/32 | UGR2 | | . . | characterised by features of the earthed electrode |
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| H01T 13/34 | UGR2 | | . . | characterised by the mounting of electrodes in insulation, e.g. by embedding |
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| H01T 13/36 | UGR2 | | . . | characterised by the joint between insulation and body, e.g. using cement |
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| H01T 13/38 | UGR2 | | . . | Selection of materials for insulation (in general H01B 3/00) |
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| H01T 13/40 | UGR1 | | . | structurally combined with other devices, e.g. for preventing unauthorised use (combined or associated with fuel injectors F02M 57/06; structurally combined with other parts of internal-combustion engines F02P 13/00) |
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| H01T 13/42 | UGR2 | | . . | with magnetic spark generators |
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| H01T 13/44 | UGR2 | | . . | with transformers, e.g. for high-frequency ignition |
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| H01T 13/46 | UGR1 | | . | having two or more spark gaps |
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| H01T 13/48 | UGR1 | | . | having means for rendering sparks visible |
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| H01T 13/50 | UGR1 | | . | having means for ionisation of gap |
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| H01T 13/52 | UGR1 | | . | characterised by a discharge along a surface |
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| H01T 13/54 | UGR1 | | . | having electrodes arranged in a partly-enclosed ignition chamber |
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| H01T 13/56 | UGR1 | | . | characterised by having component parts which are easily assembled or disassembled |
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| H01T 15/00 | HGR | Circuits specially adapted for spark gaps or other non-enclosed-discharge apparatus |
| H01T 15/02 | UGR1 | |
| H01T 17/00 | HGR | Arcing horns |
| H01T 19/00 | HGR | Devices providing for corona discharge |
| H01T 19/02 | UGR1 | |
| H01T 19/04 | UGR1 | | . | having pointed electrodes, e.g. for treating plastics |
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| H01T 20/00 | HGR | Non-enclosed-discharge apparatus not otherwise provided for [2] |
| H01T 20/02 | UGR1 | | . | Apparatus for generating ions to be introduced into non-enclosed gases, e.g. the atmosphere (ion guns H01J 3/04; generating plasma H05H) [2] |
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| H01T 21/00 | HGR | Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs |
| H01T 21/02 | UGR1 | |
| H01T 21/04 | UGR2 | |