Recently available, the count of patent claims in TLS211 in patstat, looks like a very promising piece of information.
Coverage of such data is quite good, here the counts for the two publication authorities covered:
About time coverage here are the figures for last 30 yrs in percentage (consider obviously that some publication kinds do not have a figure for claims) on allover US and EP patstat publications, by publication year
Anyway several caveat must be introduced:
1) Number of claims depends on publication language
Same patent, issued in German may have 1 or 2 claims less than in English
2) Number of claims may be different in different publications of same patent
Take FI patent EP 1186609; in TLS211 for october 2012 you will find
26, 'EP', ' 1186609', 'B1', 10, '2008-12-03', 'DE', 1, '0008'
27, 'EP', ' 1186609', 'A3', 10, '2002-10-02', 'DE', 0, ''
28, 'EP', ' 1186609', 'A2', 10, '2002-03-13', 'DE', 0, '0009'
that means publication kind A2 lists 9 claims, while B1 lists only 8.
And if we check on original documents:
http://worldwide.espacenet.com/publicationDetails/claims?CC=EP&NR=1186609A2&KC=A2&FT=D&ND=3&date=20020313&DB=worldwide.espacenet.com&locale=en_EP
http://worldwide.espacenet.com/publicationDetails/claims?CC=EP&NR=1186609B1&KC=B1&FT=D&ND=4&date=20081203&DB=worldwide.espacenet.com&locale=en_EP
We see in phase B1 one claim has been withdrawn.
Now it depends from our research question to decide if it is better to consider older (A2) or more recent (B1) number of claims.
Coverage of such data is quite good, here the counts for the two publication authorities covered:
EP
|
2669148
|
US
|
4574142
|
About time coverage here are the figures for last 30 yrs in percentage (consider obviously that some publication kinds do not have a figure for claims) on allover US and EP patstat publications, by publication year
1978
|
99,7%
|
1996
|
84,0%
|
1979
|
97,7%
|
1997
|
81,3%
|
1980
|
96,8%
|
1998
|
81,5%
|
1981
|
93,0%
|
1999
|
80,0%
|
1982
|
90,3%
|
2000
|
76,3%
|
1983
|
90,3%
|
2001
|
68,1%
|
1984
|
89,3%
|
2002
|
50,6%
|
1985
|
87,4%
|
2003
|
47,8%
|
1986
|
85,6%
|
2004
|
44,5%
|
1987
|
84,0%
|
2005
|
41,2%
|
1988
|
82,5%
|
2006
|
44,7%
|
1989
|
83,2%
|
2007
|
42,8%
|
1990
|
80,5%
|
2008
|
41,8%
|
1991
|
78,0%
|
2009
|
41,0%
|
1992
|
79,1%
|
2010
|
45,0%
|
1993
|
82,6%
|
2011
|
47,2%
|
1994
|
85,0%
|
2012
|
43,2%
|
1995
|
83,1%
|
Anyway several caveat must be introduced:
1) Number of claims depends on publication language
Same patent, issued in German may have 1 or 2 claims less than in English
2) Number of claims may be different in different publications of same patent
Take FI patent EP 1186609; in TLS211 for october 2012 you will find
26, 'EP', ' 1186609', 'B1', 10, '2008-12-03', 'DE', 1, '0008'
27, 'EP', ' 1186609', 'A3', 10, '2002-10-02', 'DE', 0, ''
28, 'EP', ' 1186609', 'A2', 10, '2002-03-13', 'DE', 0, '0009'
that means publication kind A2 lists 9 claims, while B1 lists only 8.
And if we check on original documents:
http://worldwide.espacenet.com/publicationDetails/claims?CC=EP&NR=1186609A2&KC=A2&FT=D&ND=3&date=20020313&DB=worldwide.espacenet.com&locale=en_EP
http://worldwide.espacenet.com/publicationDetails/claims?CC=EP&NR=1186609B1&KC=B1&FT=D&ND=4&date=20081203&DB=worldwide.espacenet.com&locale=en_EP
We see in phase B1 one claim has been withdrawn.
Now it depends from our research question to decide if it is better to consider older (A2) or more recent (B1) number of claims.
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