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Kind Codes - What Do They Mean?

On many patent publication numbers, you'll find letters and numbers at the end of the string. These number/letter combinations signify where the patent document fits in the overall process; If it's a new application, second version, or so on. Have a look at this handy table to see the meaning of each code:

 

Auth. Code Kind Code & Explanation Number Format
EP

A1 - Patent Application (With search report)

A2 - Patent Application (Without search report)

A3 - European Patent Application Search Report

A4 - Publ. of suppl. search report

A8 - Modified first page

A9 - Modified complete specification

B1 - Patent

B2 - Patent after modification

B3 - After limitation procedure

B8 - Modified first page granted patent

B9 - Corrected complete granted patent

nnnnnnn
WO

A1 - International application published with international search report

A2 - International application published without international search report

A3 - Later publication of ISR with revised front page

A4 - Later publication of amended claims and/or statement

B1 - Amended claims

A8 - Modified first page

A9 - International application or ISR republished with corrections, alterations or supplements

yyyynnnnnn
US

A1 - First published patent application

A2 - Republished patent application

A9 - Corrected patent application

P1 - First published plant patent application

yyyynnnnnnn (from 2001.3)
  --Granted patent nnnnnnn
  --Reissue Rnnnnn
  --Plant patent PPnnnnn
  --Defensive publication Tnnnnnn
  --Statutory invention registration (SIR) Hnnnn
  --Design patent Dnnnnnn
CN A - Unexamined application

yynnnnnn (1985 to 1988)

nnnnnnn (from 1989)

  B - Granted patent

yynnnnnn (1985 to 1988)

nnnnnnn (1989 to 1992)

nnnnnnnnn (from 2010.04) 

  C - Granted patent

nnnnnnn (1993 to 2007.7)

nnnnnnnnn (2007.8 to 2010.3)

  U - Granted utility

yynnnnnn (1985 to 1988)

nnnnnnn (1989 to 1992)

nnnnnnnnn (from 2010.04)

  Y - Granted utility

nnnnnnn (1993 to 2007.7)

nnnnnnnnn (2007.8 to 2010.3)

  S - Design

yynnnnnn (1985 to 1988)

nnnnnnn (1989 to 1992)

nnnnnnnnn (from 2010.04)

  D - Design

nnnnnnn (1993 to 2007.7)

nnnnnnnnn (2007.8 to 2010.3)

JP

A - Published unexamined patent application (or based on international application)

B1 - Published granted patent

B2 - Published examined patent application (Second level)

U - Published unexamined utility model application (or based on international application)

Y1 - Published examined utility model application

Y2 - Published utility model registration (Second level)

S - Registered design publication

D - Publication of disagreed consultation on design application

yyyynnnnnn

nnnnnnn

KR

A - Official gazette of the unexamined patents

10yyyynnnnnnn

 

B1 - Patent specification

10nnnnnnnn

 

U - Official gazette of the unexamined utility models

20yyyynnnnnnn

 

Y1 - Utility model specification

20nnnnnnnn

DE

A1 - Laid open (first publication)

A5 - Reference to international publication in German

A8 - Corrected first page

A9 - Corrected complete specification

B3 - Patent (first publication)

B4 - Patent (second publication)

B8 - Corrected first page (granted patent)

B9 - Corrected complete specification (granted patent)

C5 - Revised Patent

C8 - Corrected first page revised patent

C9 - Revised patent, corrected complete specification

U1 - Utility model

U8 - Corrected first page utility model

U9 - Corrected complete specification utility model

yynnnnn (before 1994)

nyynnnnn (1995 to 2003)

nnyyyynnnnnn (from 2004)

GB

A - Application published

B - Patent granted

A8 - Corrected first page published application

A9 - Corrected complete specification published application

B8 - Corrected first page patent specification

C - Amended or corrected patent specification

nnnnnnn

FR

A - Patent of invention (First publication)

A1 - Application for patent of invention (First publication)

A2 - Application for certificate of addition to a patent of invention (First publication)

A3 - Application for certificate of utility (First publication)

A4 - Application for a certificate of addition to a certificate of utility (First publication)

A5 - Patent of invention (First and only publication)

A6 - Certificate of addition to a patent of invention (First and only publication)

A7 - Certificate of utility (First and only publication)

A8 - Certificate of addition to a certificate of utility (First and only publication)

B1 - Patent of invention (Second publication)

B2 - Certificate of addition to a patent of invention (Second publication)

B3 - Certificate of utility (Second publication)

B4 - Certificate of addition to a certificate of utility (Second publication)

n(nnnnnn) (before 1981.8)

nnnnnnn

RU

C - Patent

C1 - Patent for invention

C2 - Patent for invention (second publication)

C8 - Modified first page granted patent

C9 - Reprinted grant patent

A - Application for invention

A8 - Modified first page application for invention

A9 - Reprinted application for invention

U1 - Certificate for utility model 

U8 - Modified first page utility model

U9 - Reprinted utility model

nnnnnn(n)

yyyynnnnnn

CH

A1 - Patent application with search report

A2 - Patent application without search report

A3 - Separate search report with first page of patent application

A8 - Rectified first page of A document

A9 - Rectified A document

B1 - Assigned patent

B2 - Modified patent

B8 - Rectified first page of B document

B9 - Rectified B document

C1 - Partial withdrawal of Swiss patent

C2 - Partial annulment of Swiss patent

C3 - Second partial withdrawal of Swiss patent

C9 - Rectified C document

nnnnnn

  

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