Numbering system - Japan

Document types and kind codes

 
KOKAI
(A, U) - enlarge

  • unexamined patent publication (A)
  • unexamined utility model publication (U)



KOKOKU
(B, Y) - enlarge

  • examined patent publication (old law) (B)
  • examined utility model publication (old law) (Y)


TOROKU
(B, U) - enlarge

  • granted patent publication (new law) (B)
  • granted utility model publication (new law) (U)


KOHYO
(A, T) - enlarge

  • PCT application entering national phase in Japan (A, T)


SAIKOHYO
(A) - enlarge  

  • Japanese PCT application entering national phase in Japan (A)

Number formats

yy-nnnnnn

  • two digits for the year (y)
  • up to six digits for the number (n)
  • application number, unexamined publication number, examined publication number (old law)
  • from 2000 onwards: four-digit Western year (yyyy-nnnnnn)
nnnnnnn
  • seven digit number (n), no year
  • grant numbers

Japanese imperial years vs. Western years

SHOWA (SHO, S)

reign of Emperor Hirohito
1926 to 1989

HEISEI (HEI, H)


reign of Emperor Akihito
1989 to date

SHOWA + 1925 = Western year
HEISEI + 1988 = Western year

NOTE: the last year SHOWA is the first year HEISEI (SHOWA 64 = HEISEI 01 = 1989)

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