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Numbering system - Japan

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Document types and kind codes

Kokai

 
KOKAI
(A, U) - enlarge

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


Kokoku
KOKOKU
(B, Y) - enlarge

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

Toroku
TOROKU
(B, U) - enlarge

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

Kohyo
KOHYO
(A, T) - enlarge

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

Saikohyo
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)

Showa

reign of Emperor Hirohito
1926 to 1989

HEISEI (HEI, H)

Heisei


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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