DIFF Subgroup
G01S 13/74 Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
Introduced: January 1980
Full Title
Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified > Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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- G01S 13/75 using transponders powered from received waves, e.g. using passive transponders since 1995 +1 CPC IPC+CPC Available in IPC and CPC
- G01S 13/76 wherein pulse-type signals are transmitted since 1980 +3 CPC IPC+CPC Available in IPC and CPC
- G01S 13/79 Systems using random coded signals or random pulse repetition frequencies since 1995 IPC+CPC Available in IPC and CPC
- G01S 13/82 wherein continuous-type signals are transmitted since 1980 +1 CPC IPC+CPC Available in IPC and CPC