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Derwent Indian patent publication number format enhanced

Patent publication numbers assigned in India (IN) are identical among the four regional patent offices, e.g., the first Indian patent publication number issued from each office in 2007 is IN 2007-1.  To ensure that publication numbers from each of the regional patent offices are unique, STN and Derwent patent publication number formats have been enhanced to distinguish patent applications by type and regional office. 

As described below, there are a number of differences between the enhanced STN and Derwent Indian patent publication number formats.  However, the differences do not affect database crossover between CAplus and DWPI.

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STN format for Indian patent publication numbers

The new STN format for Indian patents was implemented in January 2007.  Patent publication numbers now include one of eight codes to identify application type and filing office, placed in front of the five-digit publication serial number.  The codes include:

• DE national application filed in Delhi
• DN PCT application filed in Delhi
• KO national application filed in Kolkata
• KN PCT application filed in Kolkata
• MU national application filed in Mumbai
• MN PCT application filed in Mumbai
• CH national application filed in Chennai
• CN PCT application filed in Chennai

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Derwent format for Indian patent publication numbers

With the new Derwent format for Indian patents, publication numbers in the index are now appended with one of eight patent kind codes to identify application type and filing office [in place of World Intellectual Property Office (WIPO) kind codes for Indian patent publications].  The patent kind codes include:

• I1 national application filed in Delhi
• P1 PCT application filed in Delhi
• I2 national application filed in Kolkata
• P2 PCT application filed in Kolkata
• I3 national application filed in Mumbai
• P3 PCT application filed in Mumbai
• I4 national application filed in Chennai
• P4 PCT application filed in Chennai

DWPI coverage of Indian patent applications and granted patents published from December 4, 2004, to the present began when the new Indian patent legislation first took effect.  Coverage includes pre-grant (18 month) applications and national phase PCT applications issued by the four regional patent offices in India. 

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Comparison of STN and Derwent formats for Search, Expand, and Display

This table provides a summary of possible patent publication number formats for granted Indian patents:

STN Search and Expand	STN Display	Derwent Search and Expand	Derwent Display
INYYYYDEnnnnn	IN YYYYDEnnnnn	INYYYYnnnnn I1	IN---YYYYnnnnn
INYYYYDNnnnnn	IN YYYYDNnnnnn	INYYYYnnnnn P1	IN---YYYYnnnnn
INYYYYKOnnnnn	IN YYYYKOnnnnn	INYYYYnnnnn I2	IN---YYYYnnnnn
INYYYYKNnnnnn	IN YYYYKNnnnnn	INYYYYnnnnn P2	IN---YYYYnnnnn
INYYYYMUnnnnn	IN YYYYMUnnnnn	INYYYYnnnnn I3	IN---YYYYnnnnn
INYYYYMNnnnnn	IN YYYYMNnnnnn	INYYYYnnnnn P3	IN---YYYYnnnnn
INYYYYCHnnnnn	IN YYYYCHnnnnn	INYYYYnnnnn I4	IN---YYYYnnnnn
INYYYYCNnnnnn	IN YYYYCNnnnnn	INYYYYnnnnn P4	IN---YYYYnnnnn

(nnnnn = serial number with leading zeros to five digits)

To display the Derwent patent publication number format, enter SET PATENT DERWENT at an arrow prompt (=>) to change from the default STN format.  Enter SET PATENT STN to return to the STN patent publication number format.