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
 G02
OPTICS (making optical elements or apparatus B24B, B29D 11/00, C03, or other appropriate subclasses or classes; materials per se, see the relevant places, e.g. C03B, C03C)
 G02

Note(s)

In this class, the following expression is used with the meaning indicated:

  • "optical" applies not only to visible light but also to ultra-violet or infra-red radiations.  [4]

 G02C
SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B 3/02; goggles or eyeshields not having the same features as spectacles A61F 9/00)
 G02C

Note(s)

This subclass also covers monocles, pince-nez or lorgnettes.

 G02C
Subclass index
OPTICAL PARTS 7/00
NON-OPTICAL PARTS
Supporting arrangements; adjuncts 3/00, 5/00; 11/00
ATTACHMENTS OF OPTICAL PARTS TO NON-OPTICAL PARTS
Principal; auxiliary 1/00; 9/00
ASSEMBLING, REPAIRING, CLEANING 13/00
P:20 G02C 1/00
Assemblies of lenses with bridges or browbars
P:0 G02C 3/00
Special supporting arrangement for lens assemblies or monocles (lenses therefor G02C 7/00; by walking-sticks A45B 3/00)
P:50 G02C 5/00
Constructions of non-optical parts
 G02C 5/14
·  Side-members
 G02C 5/22
·  Hinges (pivotal connection in general F16C 11/00)
P:30 G02C 7/00
Optical parts (characterised by the material G02B 1/00)
 G02C 7/02
·  Lenses; Lens systems
 G02C 7/04
·  ·  Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L 12/00)
 G02C 7/06
·  ·  bifocal; multifocal
P:40 G02C 9/00
Attaching auxiliary optical parts
P:10 G02C 11/00
Non-optical adjuncts (H05B 3/84 takes precedence); Attachment thereof (G02C 7/00 takes precedence; cases A45C 11/04)
P:60 G02C 13/00
Assembling (producing spectacle frames from plastics or from substances in a plastic state B29D 12/00); Repairing; Cleaning (disinfection or sterilisation of contact lenses A61L 12/00)