(0)G04F:0/0:
IPC6
SECTION G - PHYSICS
TIME-INTERVAL MEASURING
G04F
1/1

G 04 F

 TIME-INTERVAL MEASURING (measuring pulse characteristics G 01 R, e.g. G 01 R 29/02; in radar or like systems G 01 S; masers H 01 S 1/00; generation of oscillations H 03 B; generation or counting of pulses, frequency dividing H 03 K; analogue/digital conversion in general H 03 M 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]

 

 

 
 

 1
/ 00 Apparatus 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 H 01 H 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
/ 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 (time or time-programme switches which automatically terminate their operation after the programme is completed H 01 H 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
/ 00 Apparatus for producing preselected time intervals for use as timing standards (generating clock signals for electric digital computers G 06 F 1/04 ; automatic frequency control or stabilisation of generators in general H 03 L)

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 eletronic resonators (G 04 F 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
/ 00 Apparatus for measuring unknown time intervals by non-electric means (G 04 F 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
/ 00 Apparatus 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
/ 00 Apparatus 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
/ 00 Apparatus for measuring unknown time intervals by means not provided for in groups G 04 F 5/00 to G 04 F 10/00 [2]

13
/ 02 • using optical means [2]  

13
/ 04 • using electrochemical means [2]  

13
/ 06 • using fluidic means [2]