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CPC Definition - Subclass G04F

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Last Updated Version: 2016.11
G04F
TIME-INTERVAL MEASURING (measuring pulse characteristics G01R, e.g. G01R 29/02; in radar or like systems G01S; masers H01S 1/00; generation of oscillations H03B; generation or counting of pulses, frequency dividing, analogue/digital conversion H03K {time fuzes F42C 9/00})
Definition statement

This place covers:

  • apparatus for measuring-off predetermined time intervals;
  • apparatus for producing such intervals as timing standards, e.g. metronomes;
  • apparatus for measuring unknown intervals, e.g. precision systems for short-time-interval measurement.
References
Limiting references

This place does not cover:

time fuzes

F42C 9/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

measuring pulse characteristics;

G01R, e.g. G01R 29/02

in radar or like systems;

G01S

masers;

H01S 1/00

generation of oscillations;

H03B

generation or counting of pulses, frequency dividing, analogue/digital conversion

H03K

Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timer (electric time and time-programme switches H01H 43/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

electric time and time-programme switches

H01H 43/00

Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeter with clockwork (electric time or time-programme switches H01H 43/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

electric time and time-programme switches

H01H 43/00

Apparatus for producing preselected time intervals for use as timing standards (generating clock signals for electric digital computers G06F 1/04; regulating frequency in general H03C, H03L)
References
Limiting references

This place does not cover:

generating clock signals for electric digital computers

G06F 1/04

Informative references

Attention is drawn to the following places, which may be of interest for search:

regulating frequency in general

H03C, H03L

Apparatus for measuring unknown time intervals by electric means {(timing devices for clocks or watches for comparing the rate of the oscillating member with a standard G04D 7/12; radar systems, analogous systems G01S 7/00; measuring frequency G01R 23/00; measuring phase angle G01R 25/00)}
References
Limiting references

This place does not cover:

timing devices for clocks or watches for comparing the rate of the oscillating member with a standard

G04D 7/12

Informative references

Attention is drawn to the following places, which may be of interest for search:

measuring frequency

G01R 23/00

measuring phase angle

G01R 25/00

radar systems, analogous systems

G01S 7/00

Apparatus for measuring unknown time intervals by means not provided for in groups G04F 5/00 - G04F 10/00
References
References out of a residual place

Examples of places in relation to which this place is residual:

Apparatus for producing preselected time intervals for use as timing standards

G04F 5/00

Apparatus for measuring unknown time intervals by mechanical means

G04F 7/00

Apparatus for measuring unknown time intervals by electromechanical means

G04F 8/00

Apparatus for measuring unknown time intervals by electric means

G04F 10/00