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comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current · Cooperative Patent Classification (CPC)

Electric circuits, power, telecommunications, and semiconductors.

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeH04Q1/46
Official titlecomprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
Display labelcomprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
Total patents14

Filing trend

Year-over-year patent counts classified under this CPC code.

Filing activity over the last five years is stable.

Patents filed per year
YearPatents
20156
20161
20182
20211
20243
20251

Representative patents

Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.