Table 5-25
Patent citations to S&E articles, by selected patent technology area and article field: 1998–2010
 
Technology/field Citations (n) Percent
 
Alternative energy 7,852 100.0
Chemistry 2,770 35.3
Physics 2,171 27.6
Engineering 1,532 19.5
Biological sciences 1,179 15.0
Geosciences 116 1.5
All others 84 1.1
     
Energy storage 3,909 100.0
Chemistry 2,106 53.9
Engineering 783 20.0
Physics 637 16.3
Biological sciences 338 8.6
All others 45 1.2
     
Smart grid 1,433 100.0
Physics 750 52.3
Engineering 572 39.9
Computer sciences 33 2.3
Biological sciences 31 2.2
Geosciences 20 1.4
Chemistry 19 1.3
All others 8 0.6
     
Pollution mitigation 5,390 100.0
Chemistry 1,643 30.5
Biological sciences 1,162 21.6
Geosciences 1,088 20.2
Engineering 1,068 19.8
Physics 211 3.9
Agricultural sciences 136 2.5
All others 82 1.5
 

NOTES: Citations are references to S&E articles in journals covered by Science Citation Index (SCI) and Social Sciences Citation Index (SSCI). Citation counts based on a 6-year window with 5-year lag, e.g., citations for 2002 are references in U.S. patents issued in 2002 to articles published in 1992–97. Patents may appear in more than one technology area and thus citation counts may overlap slightly. See sidebar "Identifying clean energy and pollution control patents" for details on these technology areas.

SOURCES: National Science Foundation, National Center for Science and Engineering Statistics, and The Patent Board™, special tabulations (2011) from U.S. Patent and Trademark Office (USPTO), Patent Grant Bibliographic Data, and Thomson Reuters, SCI and SSCI, http://www.thomsonreuters.com/products_services/science/.

Science and Engineering Indicators 2012