Cooperative Patent Classification

CPC Definition - Subclass G04F

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Last Updated Version: 2016.11
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

Informative references

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

measuring pulse characteristics;

in radar or like systems;

masers;

generation of oscillations;

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

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

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

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

Informative references

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

regulating frequency in general

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

Informative references

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

measuring frequency

measuring phase angle

radar systems, analogous systems

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

Apparatus for measuring unknown time intervals by mechanical means

Apparatus for measuring unknown time intervals by electromechanical means

Apparatus for measuring unknown time intervals by electric means