G
SECTION G — PHYSICS
 G

Note(s)

  1. In this section, the following term is used with the meaning indicated:
    • "variable" (as a noun) means a feature or property (e.g., a dimension, a physical condition such as temperature, a quality such as density or colour) which, in respect of a particular entity (e.g., an object, a quantity of a substance, a beam of light) and at a particular instant, is capable of being measured; the variable may change, so that its numerical expression may assume different values at different times, in different conditions or in individual cases, but may be constant in respect of a particular entity in certain conditions or for practical purposes (e.g., the length of a bar may be regarded as constant for many purposes).
  2. Attention is drawn to the definitions of terms or expressions used, appearing in the notes of several of the classes in this section, in particular those of "measuring" in class G01 and "control" and "regulation" in class G05.
  3. Classification in this section may present more difficulty than in other sections, because the distinction between different fields of use rests to a considerable extent on differences in the intention of the user rather than on any constructional differences or differences in the manner of use, and because the subjects dealt with are often in effect systems or combinations, which have features or parts in common, rather than "things", which are readily distinguishable as a whole. For example, information (e.g., a set of figures) may be displayed for the purpose of education or advertising (G09), for enabling the result of a measurement to be known (G01), for signalling the information to a distant point or for giving information which has been signalled from a distant point (G08). The words used to describe the purpose depend on features that may be irrelevant to the form of the apparatus concerned, for example, such features as the desired effect on the person who sees the display, or whether the display is controlled from a remote point. Again, a device which responds to some change in a condition, e.g., in the pressure of a fluid, may be used, without modification of the device itself, to give information about the pressure (G01L) or about some other condition linked to the pressure (another subclass of class G01, e.g., G01K for temperature), to make a record of the pressure or of its occurrence (G07C), to give an alarm (G08B), or to control another apparatus (G05).

    The classification scheme is intended to enable things of a similar nature (as indicated above) to be classified together. It is therefore particularly necessary for the real nature of any technical subject to be decided before it can be properly classified.

  
INSTRUMENTS
 G04
HOROLOGY
 G04G
ELECTRONIC TIME-PIECES  [3]
 G04G

Note(s)

  1. This subclass covers:
    • electronic time-pieces with no moving parts;  [3]
    • electronic circuitry for producing timing pulses irrespective of the nature of the time-indicating means utilised.  [3]
  2. This subclass does not cover electronic time-pieces with moving parts, which are covered by subclass G04C.  [3]
 G04G
Subclass index
PRODUCING TIMING PULSES 3/00
TIME-SETTING; SYNCHRONISING 5/00; 7/00
TIME- OR DATE-INDICATING
Visual; optical signals; acoustic signals 9/00; 11/00; 13/00
OPERATING A DEVICE AT PRESELECTED TIMES 15/00
STRUCTURAL DETAILS; HOUSINGS 17/00
ELECTRIC POWER SUPPLY CIRCUITS 19/00
INPUT OR OUTPUT DEVICES INTEGRATED IN TIME-PIECES21/00
OTHER SUBJECTS 99/00
 G04G 1/00
( transferred to G04G 99/00 )
P:60 G04G 3/00
Producing timing pulses (driving circuits for stepping motors G04C 3/00; producing preselected time intervals for use as timing standards G04F 5/00; pulse technique in general H03K; control, synchronisation, or stabilisation of generators in general H03L)  [3]
P:10 G04G 5/00
Setting, i.e. correcting or changing, the time-indication  [3]
P:0 G04G 7/00
Synchronisation  [3]
P:50 G04G 9/00
Visual time or date indication means  [3]
P:20 G04G 11/00
Producing optical signals at preselected times  [3]
P:30 G04G 13/00
Producing acoustic time signals  [3]
P:40 G04G 15/00
Time-pieces comprising means to be operated at preselected times or after preselected time intervals (G04G 11/00, G04G 13/00 take precedence; pulse delay circuits H03K 5/13; electronic time-delay switches H03K 17/28; electronic time-programme switches which automatically terminate their operation after the programme is completed H03K 17/296; time programming for television signal recording H04N 5/76)  [3]
P:80 G04G 17/00
Structural details; Housings  [7]
P:70 G04G 19/00
Electric power supply circuits specially adapted for use in electronic time-pieces  [7]
P:90 G04G 21/00
Input or output devices integrated in time-pieces  [2010.01]
P:100 G04G 99/00
Subject matter not provided for in other groups of this subclass  [2010.01]