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IPC 7
G04F-G04F01306

SECTION G – PHYSICS


G 04HOROLOGY


G 04 FTIME-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 H03K; analogue/digital conversion in general H03M 1/00) [2]


Note

 This subclass covers:

 apparatus for measuring-off predetermined time intervals;  [2]

 apparatus for producing such intervals as timing standards, e.g. metronomes;  [2]

 apparatus for measuring unknown intervals, e.g. precision systems for short-time-interval measurement.  [2]


Subclass Index

MEASURING PREDETERMINED TIME INTERVALS 

Producing time standards 

G04F 5/00 

Apparatus: without driving mechanisms; with driving mechanisms 

G04F 1/00; G04F 3/00 

MEASURING UNKNOWN TIME INTERVALS 

Mechanically; electromechanically; electrically; otherwise 

G04F 7/00; G04F 8/00; G04F 10/00; G04F 13/00 



1/

00Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timer (time or time-programme switches which automatically terminate their operation after the programme is completed H01H 43/00)

1/

02.by consuming prefixed quantities of materials, e.g. by burning candle

1/

04.by movement or acceleration due to gravity

1/

06..by flowing-away of a prefixed quantity of fine-granular or liquid materials, e.g. sand-glass, water-clock

1/

08..by a body falling a prefixed distance in air or in a viscous material


3/

00Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeter with clockwork (time or time-programme switches which automatically terminate their operation after the programme is completed H01H 43/00)

3/

02.with mechanical driving mechanisms

3/

04..Additional arrangements in connection with ordinary non-electric clocks for this purpose

3/

06.with electric driving mechanisms

3/

08..Additional arrangements in connection with ordinary electric clocks for this purpose


5/

00Apparatus for producing preselected time intervals for use as timing standards (generating clock signals for electric digital computers G06F 1/04; automatic frequency control or stabilisation of generators in general H03L)

5/

02.Metronomes

5/

04.using oscillators with electromechanical resonators  [2]

5/

06..using piezo-electric resonators  [2]

5/

08..using magnetostrictive resonators  [2]

5/

10.using electric or electronic resonators (G04F 5/14 takes precedence)  [2]

5/

12.using fluidic devices  [2]

5/

14.using atomic clocks  [2]

5/

16.using pulses produced by radio-isotopes  [2]


7/

00Apparatus for measuring unknown time intervals by non-electric means (G04F 13/06 takes precedence) [2]

7/

02.by measuring the distance of fall or the final velocity of a falling body

7/

04.using a mechanical oscillator  [2]

7/

06..running only during the time interval to be measured, e.g. stop-watch

7/

08..Watches or clocks with stop devices, e.g. chronograph

7/

10.Means used apart from the time-piece for starting or stopping same  [2]


8/

00Apparatus for measuring unknown time intervals by electromechanical means  [2]

8/

02.using an electromechanical oscillator  [2]

8/

04..using a piezo-electric oscillator  [2]

8/

06..using a magnetostrictive oscillator  [2]

8/

08.Means used apart from the time-piece for starting or stopping same  [2]


10/

00Apparatus for measuring unknown time intervals by electric means  [2]

10/

02.using oscillators with passive electric resonator, e.g. lumped LC  [2]

10/

04.by counting pulses or half-cycles of an ac  [2]

10/

06.by measuring phase  [2]

10/

08.using pulses produced by radio-isotopes  [2]

10/

10.by measuring electric or magnetic quantities changing in proportion to time  [2]


13/

00Apparatus for measuring unknown time intervals by means not provided for in groups G04F 5/00 to G04F 10/00  [2]

13/

02.using optical means  [2]

13/

04.using electrochemical means  [2]

13/

06.using fluidic means  [2]


  
 

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