G04F

TIME-INTERVAL MEASURING measuring pulse characteristics G01R, e.g. G01R29/02; in radar or like systems G01S

This subclass 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.

The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups:

G04F10/08

covered by

G04F5/16

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

G04F1/00

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

G04F1/005

using electronic timing, e.g. counting means pulse time delay arrangements H03K5/13; modifications of electronic switches for introducing a time delay before switching H03K17/28

G04F1/02

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

G04F1/04

by movement or acceleration due to gravity

G04F1/06

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

G04F1/063

using acoustic signalling

G04F1/066

using electrical contact device

G04F1/08

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

G04F3/00

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

G04F3/02

with mechanical driving mechanisms

G04F3/022

using mechanical signalling device

G04F3/025

mechanically actuated cigar or cigarette receptacles or boxes with means for limiting the frequency of smoking A24F15/005

G04F3/027

using electrical contacts, e.g. for actuating electro-acoustic device

G04F3/04

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

G04F3/06

with electric driving mechanisms

G04F3/08

Additional arrangements in connection with ordinary electric clocks for this purpose

G04F5/00

Apparatus for producing preselected time intervals for use as timing standards generating clock signals for electric digital computers G06F1/04

G04F5/02

Metronomes

G04F5/022

Mechanic metronomes

G04F5/025

Electronic metronomes rhytem generation for electrophonic musical instruments G10H1/36

G04F5/027

using electro-mechanical driving, e.g. of optical scanned recordings electrophonic musical instruments in which tones are generated by electromechanical means, e.g. by using pick-up means for reading recorded waves G10H3/00

G04F5/04

using oscillators with electromechanical resonators

producing electric oscillations or timing pulses

G04F5/06

using piezo-electric resonators

G04F5/063

Constructional details

G04F5/066

Trimmer condensators

G04F5/08

using magnetostrictive resonators

G04F5/10

using electric or electronic resonators G04F5/14 takes precedence

G04F5/12

using fluidic devices

G04F5/14

using atomic clocks

G04F5/145

using Coherent Population Trapping

G04F5/16

using pulses produced by radio-isotopes

G04F7/00

Apparatus for measuring unknown time intervals by non-electric means using fluidic means G04F13/06

G04F7/02

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

G04F7/04

using a mechanical oscillator

G04F7/06

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

G04F7/062

with reset mechanisms

G04F7/065

with start-stop control arrangements

G04F7/067

with a single push-button or actuation member for start-stop and reset

G04F7/08

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

G04F7/0804

with reset mechanisms

G04F7/0809

with single hammers, i.e. one hammer acts on each counter

G04F7/0814

with double hammer, i.e. one hammer acts on two counters

G04F7/0819

with triple hammer, i.e. one hammer acts on three counters

G04F7/0823

with couplings between the chronograph mechanism and the base movement

G04F7/0828

acting in the plane of the movement

G04F7/0833

acting perpendicular to the plane of the movement

G04F7/0838

involving a tilting movement

G04F7/0842

with start-stop control mechanisms

G04F7/0847

with column wheel

G04F7/0852

with member having a rotational two-way movement, e.g. navette

G04F7/0857

with single push-button or actuation member for start-stop and reset

G04F7/0861

actuated by other than push-buttons, e.g. bezel or lever

G04F7/0866

Special arrangements

G04F7/0871

with multiple chronograph functions, i.e. to count multiple running times alternate time counting G07C

G04F7/0876

Split-time function, e.g. rattrappante

G04F7/088

with display of fraction of seconds, e.g. foudroyante

G04F7/0885

Modular constructions involving interchangeability with one or more chronograph modules on a single base movement

G04F7/089

indicating measured time by other than hands, e.g. numbered bands, drums, discs or sheet current time indication other than by hand G04B19/20

G04F7/0895

with a separate barrel for the chronograph functions barrel in a separable module G04F7/0885

G04F7/10

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

G04F8/00

Apparatus for measuring unknown time intervals by electromechanical means

G04F8/003

using continuously running driving means

G04F8/006

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

G04F8/02

using an electromechanical oscillator

G04F5/00, G04F10/00 take precedence

G04F8/04

using a piezo-electric oscillator

G04F8/06

using a magnetostrictive oscillator

G04F8/08

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

G04F10/00

Apparatus for measuring unknown time intervals by electric means

G04F10/005

Time-to-digital converters [TDC] analog-to-digital converters with intermediate conversion to time or phase H03M1/50, H03M1/60

G04F10/02

using oscillators with passive electric resonator, e.g. lumped LC

G04F10/04, G04F10/06 and G04F10/10 take precedence

G04F10/04

by counting pulses or half-cycles of an ac

G04F10/005 takes precedence

G04F10/06

by measuring phase

G04F10/005 takes precedence

G04F10/10

by measuring electric or magnetic quantities changing in proportion to time

G04F10/105

with conversion of the time-intervals

G04F13/00

Apparatus for measuring unknown time intervals by means not provided for in groups G04F5/00 - G04F10/00

G04F13/02

using optical means

G04F13/023

using cathode-ray oscilloscopes circuits for inserting reference time markers for cathode-ray oscilloscopes G01R13/305

G04F13/026

Measuring duration of ultra-short light pulses, e.g. in the pico-second range; particular detecting devices therefor photometry, radiation pyrometry G01J1/00, G01J5/00; non-linear optics G02F1/35

G04F13/04

using electrochemical means

G04F13/06

using fluidic means