|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G04 |
HOROLOGY

|  | G04G |
ELECTRONIC TIME-PIECES [3]

|  | G04G |
Note(s) This sub-class covers: [3] electronic time-pieces with no moving parts (electronic time-pieces with moving parts are covered by sub-class Fulltext... Hierarchy... Expanded...G04C); [3] electronic circuitry for producing timing pulses irrespective of the nature of the time-indicating means utilised. [3]

|  | G04G 1/00 |
Subject matter not provided for in groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G04G 3/00-G04G 15/00 [3]

|  | G04G 3/00 |
Producing timing pulses (driving circuits for stepping motors Fulltext... Hierarchy... Expanded...G04C 3/14; producing preselected time intervals for use as timing standards Fulltext... Hierarchy... Expanded...G04F 5/00; pulse technique in general Fulltext... Hierarchy... Expanded...H03K; control, synchronisation, or stabilisation of generators in general Fulltext... Hierarchy... Expanded...H03L) [3]

|  | G04G 3/02 |
· | Circuits for deriving low frequency timing pulses from pulses of higher frequency (pulse frequency dividers in general Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H03K 23/00-H03K 29/00) [3]

|  | G04G 5/00 |
Setting, i.e. correcting or changing, the time-indication [3]

|  | G04G 5/02 |
· | by temporarily changing the number of pulses per unit time, e.g. quick-feed method [3]

|  | G04G 5/04 |
· | by setting each of the displayed values, e.g. date, hour, independently [3]

|  | G04G 7/00 |
Synchronisation [3]

|  | G04G 7/02 |
· | by radio [3]

|  | G04G 9/00 |
Visual time or date indication means [3]

|  | G04G 9/02 |
· | by selecting desired characters out of a number of characters or by selecting indicating elements the position of which represent the time, e.g. by using multiplexing techniques [3]

|  | G04G 9/04 |
· · | by controlling light sources, e.g. electroluminescent diodes [3]

|  | G04G 9/06 |
· · | using light valves, e.g. liquid crystals [3]

|  | G04G 9/08 |
· | by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques [3]

|  | G04G 9/10 |
· · | by controlling light sources, e.g. electroluminescent diodes [3]

|  | G04G 9/12 |
· · | using light valves, e.g. liquid crystals [3]

|  | G04G 11/00 |
Producing optical signals at preselected times [3]

|  | G04G 13/00 |
Producing acoustic time signals [3]

|  | G04G 13/02 |
· | at preselected times, e.g. alarm clocks [3]

|  | G04G 15/00 |
Time-pieces comprising means to be operated at preselected times or after preselected time intervals (Fulltext... Hierarchy... Expanded...G04G 11/00, Fulltext... Hierarchy... Expanded...G04G 13/00 take precedence; pulse delay circuits Fulltext... Hierarchy... Expanded...H03K 5/13; electronic time-delay switches Fulltext... Hierarchy... Expanded...H03K 17/28; electronic time-programme switches which automatically terminate their operation after the programme is completed Fulltext... Hierarchy... Expanded...H03K 17/296) [3]