G
SECTION G — PHYSICS
  
INSTRUMENTS
 G04
HOROLOGY
 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)  [2]
 G04F

Note(s)

This sub-class includes:

  1. apparatus for measuring-off predetermined time intervals;
  2. apparatus for producing such intervals as timing standards, e.g. metronomes;
  3. apparatus for measuring unknown intervals, e.g. precision systems for short-time-interval measurement. [2]

 G04F 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 (electric time or time-programme switches H01H 43/00)
 G04F 1/02
·  by consuming prefixed quantities of materials, e.g. by burning candle
 G04F 1/04
·  by movement or acceleration due to gravity
 G04F 1/06
·  ·  by flowing-away of a prefixed quantity of fine-granular or liquid materials, e.g. sand-glass, water-clock
 G04F 1/08
·  ·  by a body falling a prefixed distance in air or in a viscous material
 G04F 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 (electric time or time-programme switches H01H 43/00)
 G04F 3/02
·  with mechanical driving mechanisms
 G04F 3/04
·  ·  Additional arrangements in connection with ordinary non-electric clocks for this purpose
 G04F 3/06
·  with electric driving mechanisms
 G04F 3/08
·  ·  Additional arrangements in connection with ordinary electric clocks for this purpose
 G04F 5/00
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 H03B 3/00)
 G04F 5/02
·  Metronomes
 G04F 5/04
·  using oscillators with electromechanical resonators  [2]
 G04F 5/06
·  ·  using piezo-electric resonators  [2]
 G04F 5/08
·  ·  using magnetostrictive resonators  [2]
 G04F 5/10
·  using electric or eletronic resonators (G04F 5/14 takes precedence)  [2]
 G04F 5/12
·  using fluidic devices  [2]
 G04F 5/14
·  using atomic clocks  [2]
 G04F 5/16
·  using pulses produced by radio-isotopes  [2]
 G04F 7/00
Apparatus for measuring unknown time intervals
 G04F 7/02
·  by measuring the distance of fall or the final velocity of a falling body
 G04F 7/04
·  using a mechanical oscillator  [2]
 G04F 7/06
·  ·  running only during the time interval to be measured, e.g. stop-watch
 G04F 7/08
·  ·  Watches or clocks with stop devices, e.g. chronograph
 G04F 7/10
·  Means used apart from the time-piece for starting or stopping same  [2]
 G04F 8/00
Apparatus for measuring unknown time intervals by electromechanical means  [2]
 G04F 8/02
·  using an electromechanical oscillator  [2]
 G04F 8/04
·  ·  using a piezo-electric oscillator  [2]
 G04F 8/06
·  ·  using a magnetostrictive oscillator  [2]
 G04F 8/08
·  Means used apart from the time-piece for starting or stopping same  [2]
 G04F 9/00
( transferred to G04F 8/00, G04F 10/00 )
 G04F 10/00
Apparatus for measuring unknown time intervals by electric means  [2]
 G04F 10/02
·  using oscillators with passive electric resonator, e.g. lumped LC  [2]
 G04F 10/04
·  by counting pulses or half-cycles of an ac  [2]
 G04F 10/06
·  by measuring phase  [2]
 G04F 10/08
·  using pulses produced by radio-isotopes  [2]
 G04F 10/10
·  by measuring electric or magnetic quantities changing in proportion to time  [2]
 G04F 11/00
( transferred to G04F 7/00, G04F 8/00, G04F 10/00, G04F 13/00 )
 G04F 13/00
Apparatus for measuring unknown time intervals by means not provided for in groups G04F 5/00-G04F 10/00  [2]
 G04F 13/02
·  using optical means  [2]
 G04F 13/04
·  using electrochemical means  [2]
 G04F 13/06
·  using fluidic means  [2]