1. CPC Sections
  2. CPC Section G
  3. CPC Class G04
  4. CPC Subclass G04F
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Version: 2023.08
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CPC
COOPERATIVE PATENT CLASSIFICATION
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G04F
TIME-INTERVAL MEASURING (measuring pulse characteristics G01R, e.g. G01R 29/02; in radar or like systems G01S) [2023-02]
NOTE

  • 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.
WARNINGS

  • 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 G04F 5/16
  • {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.}
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 timers [2023-02]
G04F 1/005
.
{using electronic timing, e.g. counting means (pulse time delay arrangements H03K 5/13; modifications of electronic switches for introducing a time delay before switching H03K 17/28)} [2013-01]
G04F 1/02
.
by consuming prefixed quantities of materials, e.g. by burning candle [2013-01]
G04F 1/04
.
by movement or acceleration due to gravity [2013-01]
G04F 1/06
. .
by flowing-away of a prefixed quantity of fine-granular or liquid materials, e.g. sand-glass, water-clock [2013-01]
G04F 1/063
. . .
{using acoustic signalling} [2013-01]
G04F 1/066
. . .
{using electrical contact device} [2013-01]
G04F 1/08
. .
by a body falling a prefixed distance in air or in a viscous material [2013-01]
G04F 3/00
Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork [2023-02]
G04F 3/02
.
with mechanical driving mechanisms [2013-01]
G04F 3/022
. .
{using mechanical signalling device} [2013-01]
G04F 3/025
. .
{mechanically actuated (cigar or cigarette receptacles or boxes with means for limiting the frequency of smoking A24F 15/005)} [2013-01]
G04F 3/027
. .
{using electrical contacts, e.g. for actuating electro-acoustic device} [2013-01]
G04F 3/04
. .
Additional arrangements in connection with ordinary non-electric clocks for this purpose [2013-01]
G04F 3/06
.
with electric driving mechanisms [2013-01]
G04F 3/08
. .
Additional arrangements in connection with ordinary electric clocks for this purpose [2013-01]
G04F 5/00
Apparatus for producing preselected time intervals for use as timing standards (generating clock signals for electric digital computers G06F 1/04) [2023-02]
G04F 5/02
.
Metronomes [2023-02]
G04F 5/022
. .
{Mechanic metronomes} [2013-01]
G04F 5/025
. .
{Electronic metronomes (rhytem generation for electrophonic musical instruments G10H 1/36)} [2015-11]
G04F 5/027
. .
{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 G10H 3/00)} [2016-08]
G04F 5/04
.
using oscillators with electromechanical resonators {producing electric oscillations or timing pulses} [2013-01]
G04F 5/06
. .
using piezoelectric resonators [2023-08]
G04F 5/063
. . .
{Constructional details} [2023-02]
G04F 5/066
. . . .
{Trimmer condensators} [2023-02]
G04F 5/08
. .
using magnetostrictive resonators [2013-01]
G04F 5/10
.
using electric or electronic resonators (G04F 5/14 takes precedence) [2013-01]
G04F 5/12
.
using fluidic devices [2013-01]
G04F 5/14
.
using atomic clocks [2013-01]
G04F 5/145
. .
{using Coherent Population Trapping} [2013-01]
G04F 5/16
.
using pulses produced by radio-isotopes [2023-02]
G04F 7/00
Apparatus for measuring unknown time intervals by non-electric means (using fluidic means G04F 13/06) [2023-02]
G04F 7/02
.
by measuring the distance of fall or the final velocity of a falling body [2013-01]
G04F 7/04
.
using a mechanical oscillator [2020-01]
G04F 7/06
. .
running only during the time interval to be measured, e.g. stop-watch [2013-01]
G04F 7/062
. . .
{with reset mechanisms} [2013-01]
G04F 7/065
. . .
{with start-stop control arrangements} [2013-01]
G04F 7/067
. . . .
{with a single push-button or actuation member for start-stop and reset} [2013-01]
G04F 7/08
. .
Watches or clocks with stop devices, e.g. chronograph [2013-01]
G04F 7/0804
. . .
{with reset mechanisms} [2013-01]
G04F 7/0809
. . . .
{with single hammers, i.e. one hammer acts on each counter} [2013-01]
G04F 7/0814
. . . .
{with double hammer, i.e. one hammer acts on two counters} [2013-01]
G04F 7/0819
. . . .
{with triple hammer, i.e. one hammer acts on three counters} [2013-01]
G04F 7/0823
. . .
{with couplings between the chronograph mechanism and the base movement} [2013-01]
G04F 7/0828
. . . .
{acting in the plane of the movement} [2013-01]
G04F 7/0833
. . . .
{acting perpendicular to the plane of the movement} [2013-01]
G04F 7/0838
. . . .
{involving a tilting movement} [2013-01]
G04F 7/0842
. . .
{with start-stop control mechanisms} [2013-01]
G04F 7/0847
. . . .
{with column wheel} [2013-01]
G04F 7/0852
. . . .
{with member having a rotational two-way movement, e.g. navette} [2013-01]
G04F 7/0857
. . . .
{with single push-button or actuation member for start-stop and reset} [2013-01]
G04F 7/0861
. . . .
{actuated by other than push-buttons, e.g. bezel or lever} [2013-01]
G04F 7/0866
. . .
{Special arrangements} [2013-01]
G04F 7/0871
. . . .
{with multiple chronograph functions, i.e. to count multiple running times (alternate time counting G07C)} [2013-01]
G04F 7/0876
. . . .
{Split-time function, e.g. rattrappante} [2016-08]
G04F 7/088
. . . .
{with display of fraction of seconds, e.g. foudroyante} [2013-01]
G04F 7/0885
. . . .
{Modular constructions involving interchangeability with one or more chronograph modules on a single base movement} [2013-01]
G04F 7/089
. . . .
{indicating measured time by other than hands, e.g. numbered bands, drums, discs or sheet (current time indication other than by hand G04B 19/20)} [2016-08]
G04F 7/0895
. . . .
{with a separate barrel for the chronograph functions (barrel in a separable module G04F 7/0885)} [2013-01]
G04F 7/10
.
Means used apart from the time-piece for starting or stopping same [2023-02]
G04F 8/00
Apparatus for measuring unknown time intervals by electromechanical means [2013-01]
G04F 8/003
.
{using continuously running driving means} [2013-01]
G04F 8/006
.
{running only during the time interval to be measured, e.g. stop-watch} [2013-01]
G04F 8/02
.
using an electromechanical oscillator {(G04F 5/00, G04F 10/00 take precedence)} [2013-01]
G04F 8/04
. .
using a piezoelectric oscillator [2023-08]
G04F 8/06
. .
using a magnetostrictive oscillator [2019-05]
G04F 8/08
.
Means used apart from the time-piece for starting or stopping same [2013-01]
G04F 10/00
Apparatus for measuring unknown time intervals by electric means [2023-02]
G04F 10/005
.
{Time-to-digital converters [TDC] (analog-to-digital converters with intermediate conversion to time or phase H03M 1/50, H03M 1/60)} [2016-11]
G04F 10/02
.
using oscillators with passive electric resonator, e.g. lumped LC {(G04F 10/04, G04F 10/06 and G04F 10/10 take precedence)} [2013-01]
G04F 10/04
.
by counting pulses or half-cycles of an ac {(G04F 10/005 takes precedence)} [2023-02]
G04F 10/06
.
by measuring phase {(G04F 10/005 takes precedence)} [2013-01]
G04F 10/10
.
by measuring electric or magnetic quantities changing in proportion to time [2013-01]
G04F 10/105
. .
{with conversion of the time-intervals} [2013-01]
G04F 13/00
Apparatus for measuring unknown time intervals by means not provided for in groups G04F 5/00 - G04F 10/00 [2016-05]
G04F 13/02
.
using optical means [2013-01]
G04F 13/023
. .
{using cathode-ray oscilloscopes (circuits for inserting reference time markers for cathode-ray oscilloscopes G01R 13/305)} [2013-01]
G04F 13/026
. .
{Measuring duration of ultra-short light pulses, e.g. in the pico-second range; particular detecting devices therefor (photometry, radiation pyrometry G01J 1/00, G01J 5/00; non-linear optics G02F 1/35)} [2023-02]
G04F 13/04
.
using electrochemical means [2016-11]
G04F 13/06
.
using fluidic means [2016-11]