IPC Definitions - January 01, 2012
H04Q - Definition
This subclass covers:
Methods, circuits, or apparatus for selectively establishing a connection between a desired number of stations (normally two), or between a main station and a desired number of substations (normally one) for the purpose of transferring information via this connection after it has been established; and
Selective calling arrangements over connections already established.
As the scope of H04Q covers a diversity of subject matter, the user is referred to the IPC definitions for the main groups of H04Q.
The following list is intended to assist the user:
References relevant to classification in this subclass
This subclass does not cover:
Electric switches; Relays; Selectors | H01H |
Multiplex communication | H04J |
Wireless communication networks | H04W |
Attention is drawn to the following places, which may be of interest for search:
Cables; Conductors | H01B |
Installation of communication cables or lines | H02G |
Electronic switches | H03K 17/00 |
Transmission in general | H04B |
Broadcast communication | H04H |
Transmission of digital information | H04L |
Telephonic communication | H04M |
In this subclass, the following terms or expressions are used with the meaning indicated:
Satellite | A kind of exchange the operation of which depends upon control signals received from a supervisory exchange. |
Subscriber | General term for terminal equipment, e.g. telephone for public use. |
Substation | Subscriber or monitoring equipment which may connect a single subscriber to a line without choice as to subscriber. |
Switching centres | Include exchanges and satellites. |