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CPC Definition - Subclass G04F

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Last Updated Version: 2023.02
G04F
TIME-INTERVAL MEASURING (measuring pulse characteristics G01R, e.g. G01R 29/02; in radar or like systems G01S)
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:

Measuring pulse characteristics

G01R, e.g. G01R 29/02

Measuring in radar or like systems

G01S

Informative references

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

Time fuzes

F24C 9/00

Masers

H01S 1/00

Generation of oscillations

H03B

Generation or counting of pulses or frequency dividing

H03K

Analogue/digital conversion in general

H03M 1/00

Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers
References
Informative references

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

Time or time-programme switches which automatically terminate their operations after the programme is completed

H01H 43/00

Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork
References
Informative references

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

Time or time-programme switches which automatically terminate their operations after the programme is completed

H01H 43/00

Apparatus for producing preselected time intervals for use as timing standards (generating clock signals for electric digital computers G06F 1/04)
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:

Automatic frequency control or stabilisation of generators in general

H03L

Metronomes
References
Informative references

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

Periodical acoustic signalling arrangements

G04B 21/005

{Constructional details}
References
Informative references

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

Details of resonators in general

H03H 9/02

{Trimmer condensators}
References
Informative references

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

Capacitors in general

H01G

Means used apart from the time-piece for starting or stopping same
References
Informative references

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

Means used apart from the time-piece for starting or stopping same

G04F 8/08

Apparatus for measuring unknown time intervals by electric means
References
Informative references

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

Arrangements for measuring frequencies

G01R 23/00

Arrangements for measuring phase angle between a voltage and a current or between voltages or currents

G01R 25/00

Radar systems, analogous systems

G01S 7/00

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

G04D 7/12

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

{Measuring duration of ultra-short light pulses, e.g. in the pico-second range; particular detecting devices therefor (photometry, radiation pyrometry G01J 1/00, G01J 5/00; non-linear optics G02F 1/35)}
References
Limiting references

This place does not cover:

Photometry

G01J 1/00

Radiation pyrometry

G01J 5/00

Non-linear optics

G02F 1/35

Informative references

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

Monitoring arrangements for lasers in general

H01S 3/0014