|  | H |
SECTION H — ELECTRICITY

|  | H01 |
BASIC ELECTRIC ELEMENTS

|  | H01 |
Note(s) Processes involving only a single technical art, e.g. drying, coating, for which provision exists elsewhere are classified in the relevant class for that art.

|  | H01C |
RESISTORS

|  | H01C |
Note(s) In this sub-class, the term "adjustable" means mechanically adjustable. [2] Variable resistors, the value of which is changed non-mechanically, e.g. by voltage or temperature, are classified in group Fulltext... Hierarchy... Expanded...H01C 7/00. [2]

|  | H01C 1/00 |
Details

|  | H01C 1/01 |
· | Mounting; Supporting [2]

|  | H01C 1/012 |
· · | the base extending along, and imparting rigidity or reinforcement to, the resistive element (Fulltext... Hierarchy... Expanded...H01C 1/016 takes precedence; the resistive element being formed in two or more coils or loops as a spiral, helical, or toroidal winding Fulltext... Hierarchy... Expanded...H01C 3/18, Fulltext... Hierarchy... Expanded...H01C 3/20; the resistive element being formed as one or more layers or coatings on a base Fulltext... Hierarchy... Expanded...H01C 7/00) [2]

|  | H01C 1/014 |
· · | the resistor being suspended between, and being supported by, two supporting sections (Fulltext... Hierarchy... Expanded...H01C 1/016 takes precedence) [2]

|  | H01C 1/016 |
· · | with compensation for resistor expansion or contraction [2]

|  | H01C 1/02 |
· | Housing; Enclosing; Embedding; Filling the housing or enclosure [2]

|  | H01C 1/022 |
· · | the housing or enclosure being openable or separable from the resistive element [2]

|  | H01C 1/024 |
· · | the housing or enclosure being hermetically sealed (Fulltext... Hierarchy... Expanded...H01C 1/028, Fulltext... Hierarchy... Expanded...H01C 1/032, Fulltext... Hierarchy... Expanded...H01C 1/034 take precedence) [2]

|  | H01C 1/026 |
· · · | with gaseous or vacuum spacing between the resistive element and the housing or casing [2]

|  | H01C 1/028 |
· · | the resistive element being embedded in insulation with outer enclosing sheath [2]

|  | H01C 1/03 |
· · · | with powdered insulation [2]

|  | H01C 1/032 |
· · | plural layers surrounding the resistive element (Fulltext... Hierarchy... Expanded...H01C 1/028 takes precedence) [2]

|  | H01C 1/034 |
· · | the housing or enclosure being formed as coating or mold without outer sheath (Fulltext... Hierarchy... Expanded...H01C 1/032 takes precedence) [2]

|  | H01C 1/036 |
· · · | on wound resistive element [2]

|  | H01C 1/04 |
· | Arrangements of distinguishing marks, e.g. colour coding

|  | H01C 1/06 |
· | Electrostatic or electromagnetic shielding arrangements

|  | H01C 1/08 |
· | Cooling, heating, or ventilating arrangements

|  | H01C 1/082 |
· · | using forced fluid flow [2]

|  | H01C 1/084 |
· · | using self-cooling, e.g. fins, heat sinks [2]

|  | H01C 1/12 |
· | Arrangements of current collectors

|  | H01C 1/125 |
· · | of fluid contacts [2]

|  | H01C 1/14 |
· | Terminals or tapping points specially adapted for resistors (in general Fulltext... Hierarchy... Expanded...H01R); Arrangements of terminals or tapping points on resistors

|  | H01C 1/142 |
· · | the terminals or tapping points being coated on the resistive element [2]

|  | H01C 1/144 |
· · | the terminals or tapping points being welded or soldered [2]

|  | H01C 1/146 |
· · | the resistive element surrounding the terminal [2]

|  | H01C 1/148 |
· · | the terminals embracing or surrounding the resistive element (Fulltext... Hierarchy... Expanded...H01C 1/142 takes precedence) [2]

|  | H01C 1/16 |
· | Resistor networks not otherwise provided for

|  | H01C 3/00 |
Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven, or formed as grids

|  | H01C 3/02 |
· | arranged or constructed for reducing self-induction, capacitance, or variation with frequency

|  | H01C 3/04 |
· | Iron-filament ballast resistors; Other resistors having variable temperature coefficient

|  | H01C 3/06 |
· | Flexible or folding resistors, whereby such a resistor can be looped or collapsed upon itself [2]

|  | H01C 3/08 |
· | Dimension or characteristic of resistive element changing gradually or in discrete steps from one terminal to another [2]

|  | H01C 3/10 |
· | the resistive element having zig-zag or sinusoidal configuration [2]

|  | H01C 3/12 |
· · | lying in one plane [2]

|  | H01C 3/14 |
· | the resistive element being formed in two or more coils or loops continuously wound as a spiral, helical, or toroidal winding (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01C 3/02-H01C 3/12 take precedence) [2]

|  | H01C 3/16 |
· · | including two or more distinct wound elements, or two or more winding patterns [2]

|  | H01C 3/18 |
· · | wound on a flat or ribbon base (Fulltext... Hierarchy... Expanded...H01C 3/16 takes precedence) [2]

|  | H01C 3/20 |
· · | wound on cylindrical or prismatic base (Fulltext... Hierarchy... Expanded...H01C 3/16 takes precedence) [2]

|  | H01C 7/00 |
Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material (consisting of loose powdered or granular material Fulltext... Hierarchy... Expanded...H01C 8/00; resistors with a potential-jump barrier or surface barrier, e.g. field effect resistors, Fulltext... Hierarchy... Expanded...H01L 29/00; semiconductor devices sensitive to electromagnetic or corpuscular radiation, e.g. photoresistors, Fulltext... Hierarchy... Expanded...H01L 31/00; devices using superconductivity Fulltext... Hierarchy... Expanded...H01L 39/00; devices using galvano-magnetic or similar magnetic effects, e.g. magnetic-field-controlled resistors, Fulltext... Hierarchy... Expanded...H01L 43/00; solid state devices for rectifying, amplifying, oscillating, or switching without a potential-jump barrier or surface barrier Fulltext... Hierarchy... Expanded...H01L 45/00; bulk negative resistance effect devices Fulltext... Hierarchy... Expanded...H01L 47/00) [2]

|  | H01C 7/02 |
· | having positive temperature coefficient

|  | H01C 7/04 |
· | having negative temperature coefficient

|  | H01C 7/06 |
· | including means to minimise changes in resistance with changes in temperature

|  | H01C 7/10 |
· | voltage-responsive

|  | H01C 7/12 |
· · | Overvoltage protection resistors; Arresters

|  | H01C 7/13 |
· | current-responsive [2]

|  | H01C 7/18 - H01C 7/22 |
Note(s) Groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01C 7/02-H01C 7/13 take precedence over groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01C 7/18-H01C 7/22. [2]

|  | H01C 7/18 |
· | comprising a plurality of layers stacked between terminals [2]

|  | H01C 7/20 |
· | the resistive layer or coating being tapered [2]

|  | H01C 7/22 |
· | Elongated resistive element being bent or curved, e.g. sinusoidal, helical [2]

|  | H01C 8/00 |
Non-adjustable resistors consisting of loose powdered or granular conducting, or powdered or granular semi-conducting material [2]

|  | H01C 8/02 |
· | Coherers or like imperfect resistors for detecting electromagnetic waves [2]

|  | H01C 8/04 |
· | Overvoltage protection resistors; Arresters [2]

|  | H01C 10/00 |
Adjustable resistors [2]

|  | H01C 10/02 |
· | Liquid resistors [2]

|  | H01C 10/04 |
· | with specified mathematical relationship between movement of resistor actuating means and value of resistance, other than direct proportional relationship [2]

|  | H01C 10/06 |
· | adjustable by short-circuiting different amounts of the resistive element [2]

|  | H01C 10/08 |
· · | with intervening conducting structure between the resistive element and the short-circuiting means, e.g. taps [2]

|  | H01C 10/10 |
· | adjustable by mechanical pressure or force [2]

|  | H01C 10/12 |
· · | by changing surface pressure between resistive masses or resistive and conductive masses, e.g. pile type [2]

|  | H01C 10/14 |
· | adjustable by auxiliary driving means [2]

|  | H01C 10/16 |
· | including plural resistive elements [2]

|  | H01C 10/18 |
· · | including coarse and fine resistive elements [2]

|  | H01C 10/20 |
· · | Contact structure or movable resistive elements being ganged [2]

|  | H01C 10/22 |
· | resistive-element dimensions changing gradually in one direction, e.g. tapered resistive element (Fulltext... Hierarchy... Expanded...H01C 10/04 takes precedence) [2]

|  | H01C 10/23 |
· | resistive-element dimensions changing in a series of discrete, progressive steps [2]

|  | H01C 10/24 |
· | the contact moving along turns of a helical resistive element, or vice versa [2]

|  | H01C 10/26 |
· | resistive element moving (Fulltext... Hierarchy... Expanded...H01C 10/16, Fulltext... Hierarchy... Expanded...H01C 10/24 take precedence) [2]

|  | H01C 10/28 - H01C 10/50 |
Note(s) Groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01C 10/02-H01C 10/26 take precedence over groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01C 10/28-H01C 10/50. [2]

|  | H01C 10/28 |
· | the contact rocking or rolling along resistive element or taps [2]

|  | H01C 10/30 |
· | the contact sliding along resistive element [2]

|  | H01C 10/32 |
· · | the contact moving in an arcuate path [2]

|  | H01C 10/34 |
· · · | the contact or the associated conducting structure riding on collector formed as a ring or portion thereof [2]

|  | H01C 10/36 |
· · · | structurally combined with switching arrangements [2]

|  | H01C 10/38 |
· · | the contact moving along a straight path [2]

|  | H01C 10/40 |
· · · | screw-operated [2]

|  | H01C 10/42 |
· · · · | the contact bridging and sliding along resistive element and parallel conducting bar or collector [2]

|  | H01C 10/44 |
· · · | the contact bridging and sliding along resistive element and parallel conducting bar or collector (Fulltext... Hierarchy... Expanded...H01C 10/42 takes precedence) [2]

|  | H01C 10/46 |
· | Arrangements of fixed resistors with intervening connectors, e.g. taps (Fulltext... Hierarchy... Expanded...H01C 10/28, Fulltext... Hierarchy... Expanded...H01C 10/30 take precedence) [2]

|  | H01C 10/48 |
· · | including contact movable in an arcuate path [2]

|  | H01C 10/50 |
· | structurally combined with switching arrangement (Fulltext... Hierarchy... Expanded...H01C 10/36 takes precedence) [2]

|  | H01C 11/00 |
Non-adjustable liquid resistors [2]

|  | H01C 13/00 |
Resistors not provided for elsewhere

|  | H01C 13/02 |
· | Structural combinations of resistors (impedance networks per se Fulltext... Hierarchy... Expanded...H03H) [2]

|  | H01C 17/00 |
Apparatus or processes specially adapted for manufacturing resistors (providing fillings for housings or enclosures Fulltext... Hierarchy... Expanded...H01C 1/02; reducing insulation surrounding a resistor to powder Fulltext... Hierarchy... Expanded...H01C 1/03; manufacture of thermally variable resistors Fulltext... Hierarchy... Expanded...H01C 7/02, Fulltext... Hierarchy... Expanded...H01C 7/04) [2]

|  | H01C 17/02 |
· | adapted for manufacturing resistors with envelope or housing [2]

|  | H01C 17/04 |
· | adapted for winding the resistive element [2]

|  | H01C 17/06 |
· | adapted for coating resistive material on a base [2]

|  | H01C 17/08 |
· · | by vapour deposition [2]

|  | H01C 17/10 |
· · | by flame spraying [2]

|  | H01C 17/12 |
· · | by sputtering [2]

|  | H01C 17/14 |
· · | by chemical deposition [2]

|  | H01C 17/16 |
· · · | using electric current [2]

|  | H01C 17/18 |
· · · | without using electric current [2]

|  | H01C 17/20 |
· · | by pyrolytic processes [2]

|  | H01C 17/22 |
· | adapted for trimming [2]

|  | H01C 17/24 |
· · | by removing or adding resistive material [2]

|  | H01C 17/26 |
· · | by converting resistive material [2]

|  | H01C 17/28 |
· | adapted for applying terminals [2]

|  | H01C 17/30 |
· | adapted for baking [2]