Are invalid patents still cited?

ABSTRACT Patents contain reference citations. However, unlike journal papers, patents may become invalid if they are not maintained or have expired. This study determines whether invalid patents are still cited. We collected telecommunications patents as a sample to compare the citations of valid an...

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Bibliographic Details
Published inProceedings of the Association for Information Science and Technology Vol. 56; no. 1; pp. 639 - 641
Main Authors Dong, Huei‐Ru, Chen, Dar‐Zen, Huang, Mu‐Hsuan
Format Journal Article
LanguageEnglish
Published Hoboken, USA John Wiley & Sons, Inc 2019
Subjects
citation analysis
Informetrics
patentometrics
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Summary:ABSTRACT Patents contain reference citations. However, unlike journal papers, patents may become invalid if they are not maintained or have expired. This study determines whether invalid patents are still cited. We collected telecommunications patents as a sample to compare the citations of valid and invalid patents. The results indicated that approximately 50% of cited patents were invalid. Furthermore, the citations per patent of invalid patents were fewer than those of valid ones. Nevertheless, the citations per patent of invalid patents were reduced 5.21, and nearly 5% of the patents were cited only after they became invalid.
ISSN:2373-9231
2373-9231
DOI:10.1002/pra2.117