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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised

CPC
COOPERATIVE PATENT CLASSIFICATION
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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)
{
time fuzes F42C 9/00
}
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.

WARNING
-
The following IPC groups are not used in the CPC scheme. Subject matter covered by these groups is classified in the following CPC groups:
G04F10/08 covered by G04F 5/16

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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 and time-programme switches H01H 43/00)
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)
}
G04F 1/02
.
by consuming prefixed quantities of materials, e.g. by burning candle
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G04F 1/04
.
by movement or acceleration due to gravity
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G04F 1/06
. .
by flowing-away of a prefixed quantity of fine-granular or liquid materials, e.g. sand-glass, water-clock
G04F 1/063
. . .
{
using acoustic signalling
}
G04F 1/066
. . .
{
using electrical contact device
}
G04F 1/08
. .
by a body falling a prefixed distance in air or in a viscous material
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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)
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G04F 3/02
.
with mechanical driving mechanisms
G04F 3/022
. .
{
using mechanical signalling device
}
G04F 3/025
. .
{
mechanically actuated (cigar or cigarette receptacles or boxes with means for limiting the frequency of smoking A24F 15/005)
}
G04F 3/027
. .
{
using electrical contacts, e.g. for actuating electro-acoustic device
}
G04F 3/04
. .
Additional arrangements in connection with ordinary non-electric clocks for this purpose
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G04F 3/06
.
with electric driving mechanisms
G04F 3/08
. .
Additional arrangements in connection with ordinary electric clocks for this purpose
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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 H03C, H03L)
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G04F 5/02
.
Metronomes
{
periodic signalisation by acoustic signals in general G04B 21/005
}
G04F 5/022
. .
{
Mechanic metronomes
}
G04F 5/025
. .
{
Electronic metronomes
}
{
rhytem generation for electrophonic musical instruments G10H 1/36
}
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)
}
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G04F 5/04
.
using oscillators with electromechanical resonators
{
producing electric oscillations or timing pulses
}
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G04F 5/06
. .
using piezoelectric resonators
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G04F 5/063
. . .
{
Constructional details
}
(details of resonators in general H03H 9/02)
G04F 5/066
. . . .
{
Trimmer condensators (capacitors in general H01G)
}
G04F 5/08
. .
using magnetostrictive resonators
G04F 5/10
.
using electric or electronic resonators (G04F 5/14 takes precedence)
G04F 5/12
.
using fluidic devices
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G04F 5/14
.
using atomic clocks
G04F 5/145
. .
{
using Coherent Population Trapping
}
G04F 5/16
.
using pulses produced by radioisotopes
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G04F 7/00
Apparatus for measuring unknown time intervals by mechanical means
G04F 7/02
.
by measuring the distance of fall or the final velocity of a falling body
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G04F 7/04
.
using a mechanical oscillator
WARNING
-
The subgroups of G04F/04 are not complete pending reclassification; see also this group

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G04F 7/06
. .
running only during the time interval to be measured, e.g. stop-watch
G04F 7/062
. . .
{
with reset mechanisms
}
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G04F 7/065
. . .
{
with start-stop control arrangements
}
G04F 7/067
. . . .
{
with a single push-button or actuation member for start-stop and reset
}
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G04F 7/08
. .
Watches or clocks with stop devices, e.g. chronograph
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G04F 7/0804
. . .
{
with reset mechanisms
}
G04F 7/0809
. . . .
{
with single hammers, i.e. one hammer acts on each counter
}
G04F 7/0814
. . . .
{
with double hammer , i.e. one hammer acts on two counters
}
G04F 7/0819
. . . .
{
with triple hammer, i.e. one hammer acts on three counters
}
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G04F 7/0823
. . .
{
with couplings between the chronograph mechanism and the base movement
}
G04F 7/0828
. . . .
{
acting in the plane of the movement
}
G04F 7/0833
. . . .
{
acting perpendicular to the plane of the movement
}
G04F 7/0838
. . . .
{
involving a tilting movement
}
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G04F 7/0842
. . .
{
with start-stop control mechanisms
}
G04F 7/0847
. . . .
{
with column wheel
}
G04F 7/0852
. . . .
{
with member having a rotational two-way movement, e.g. navette
}
G04F 7/0857
. . . .
{
with single push-button or actuation member for start-stop and reset
}
G04F 7/0861
. . . .
{
actuated by other than push-buttons, e.g. bezel or lever
}
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G04F 7/0866
. . .
{
Special arrangements
}
G04F 7/0871
. . . .
{
with multiple chronograph functions, i.e. to count multiple running times (alternate time counting G07C)
}
G04F 7/0876
. . . .
{
Split-time function e.g. rattrappante
}
G04F 7/088
. . . .
{
with display of fraction of seconds, e.g. foudroyante
}
G04F 7/0885
. . . .
{
Modular constructions involving interchangeability with one or more chronograph modules on a single base movement
}
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)
}
G04F 7/0895
. . . .
{
with a separate barrel for the chronograph functions (barrel in a separable module G04F 7/0885)
}
G04F 7/10
.
Means used apart from the time-piece for starting or stopping same
{
see provisionally too : G04F 8/08
}
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G04F 8/00
Apparatus for measuring unknown time intervals by electromechanical means
G04F 8/003
.
{
using continuously running driving means
}
G04F 8/006
.
{
running only during the time interval to be measured, e.g. stop-watch
}
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G04F 8/02
.
using an electromechanical oscillator
{
G04F 5/00, G04F 10/00 take precedence
}
G04F 8/04
. .
using a piezoelectric oscillator
{
not used
}
G04F 8/06
. .
using a magnetostrictive oscillator
{
not used
}
G04F 8/08
.
Means used apart from the time-piece for starting or stopping same
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Apparatus for measuring unknown time intervals by electric means
{
timing devices for clocks or watches for comparing the rate of the oscillating member with a standard G04D 7/12; radar systems, analogous systems G01S 7/00; measuring frequency G01R 23/00; measuring phase angle G01R 25/00
}
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)]
WARNING
-
This group is not complete pending reclassification; see also groups G04F 10/04 and G04F 10/06

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
}
G04F 10/04
.
by counting pulses or half-cycles of an alternating current
{
(G04F 10/005 takes precedence)
}
G04F 10/06
.
by measuring phase
{
(G04F 10/005 takes precedence)
}
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G04F 10/10
.
by measuring electric or magnetic quantities changing in proportion to time
G04F 10/105
. .
{
with conversion of the time-intervals
}
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Apparatus for measuring unknown time intervals by means not provided for in groups G04F 5/00 to G04F 10/00
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G04F 13/02
.
using optical means
G04F 13/023
. .
{
using cathode-ray oscilloscopes (circuits for inserting reference time markers for cathode-ray oscilloscopes G01R 13/305)
}
G04F 13/026
. .
{
Measuring duration of ultra-short light pulses, e.g. in the pico-second range; particular detecting devices therefor (non-linear optics G02F 1/35; monitoring arrangements for lasers in general H01S 3/0014; photometry, radiation pyrometry G01J 1/00, G01J 5/00)
}
G04F 13/04
.
using electrochemical means
WARNING
-
Not complete, see also G04F 10/00

G04F 13/06
.
using fluidic means
WARNING
-
Not complete, see also G04F 10/00

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Last Modified: 10/10/2013