|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G04 |
HOROLOGY

|  | G04F |
TIME-INTERVAL MEASURING (measuring pulse characteristics Fulltext... Hierarchy... Expanded...G01R, e.g. Fulltext... Hierarchy... Expanded...G01R 29/02; in radar or like systems Fulltext... Hierarchy... Expanded...G01S; masers Fulltext... Hierarchy... Expanded...H01S 1/00; generation of oscillations Fulltext... Hierarchy... Expanded...H03B; generation or counting of pulses, frequency dividing, analogue/digital conversion Fulltext... Hierarchy... Expanded...H03K) [2]

|  | G04F |
Note(s) This sub-class includes: 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. [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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...G06F 1/04; regulating frequency in general Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...G04F 8/00, Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...G04F 7/00, Fulltext... Hierarchy... Expanded...G04F 8/00, Fulltext... Hierarchy... Expanded...G04F 10/00, Fulltext... Hierarchy... Expanded...G04F 13/00 )

|  | G04F 13/00 |
Apparatus for measuring unknown time intervals by means not provided for in groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...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]