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Data Analysis and Knowledge Discovery  2022, Vol. 6 Issue (10): 57-67    DOI: 10.11925/infotech.2096-3467.2021.1458
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Extracting Patent Keywords by Integrating Restriction Relationship
Yu Yan(),Zhu Shengchen
Institute of the Information Management and Technology, Nanjing Tech University, Nanjing 210009, China
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Abstract  

[Objective] This paper tries to improve the accuracy of patent keyword extraction with the characteristics of patent claims. [Methods] We examined the restriction relationship between technical features of patent claims. Then, we integrated these relationship into the patent keyword extraction method based on graph. [Results] We examined our model with the USPTO and Baiten data sets for patents. The MRR index of our method was 31.79% (USPTO) and 33.81% (Baiten) higher than the traditional TextRank method. [Limitations] The data of our experimental analysis need to be further expanded. [Conclusions] The proposed method could significantly improve the accuracy of patent keyword extraction.
Key words： PatentExtraction      Restriction Relationship      Claim      TextRank     
Received: 27 December 2021      Published: 16 November 2022
ZTFLH:  TP393 G250  
Fund:National Social Science Fund of China(17BTQ059)
Corresponding Authors: Yu Yan,ORCID：0000-0002-9654-8614      E-mail: yuyanyuyan2004@126.com
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Yan Yu
Shengchen Zhu

Cite this article:

Yu Yan, Zhu Shengchen. Extracting Patent Keywords by Integrating Restriction Relationship. Data Analysis and Knowledge Discovery, 2022, 6(10): 57-67.

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https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/10.11925/infotech.2096-3467.2021.1458     OR     https://manu44.magtech.com.cn/Jwk_infotech_wk3/EN/Y2022/V6/I10/57

Example of Restricted Relationships Diagram
Restricted Relationships in Patent Claims
Example of Graph Building
数据集 专利数 平均权利要求数 平均关键词数
USPTO 200 17.28 7.83
Baiten 500 9.93 10
Data Set Information
方法 MRR
USPTO Baiten
PageRank+Word 1.48 1.36
PageRank+Phrase 1.61 1.49
Evaluation Results of Candidate Keywords as Vertex
方法 排名 抽取的前10个关键词 MRR
PageRank+
Word		 1
2
3
4
5
6
7
8
9
10		 electrolyte additive composition
novel borate-based lithium compound
borate-based lithium compound
additive composition
electrolyte additive
borate-based compound
phosphate-based compound tributyl
phosphate
vinyl silane-based compound
non-lithiated additive
fluorocarbonate-based compound		 1.87
PageRank+Phrase 1
2
3
4
5
6
7
8
9
10		 electrolyte additive composition
lithium secondary battery
non-lithiated additive
borate-based lithium compound
tetravinyl silane
sultone-based compound
alkyltrivinyl_silane
sulfite-based compound
vinyl silane-based compound
linear carbonate solvent		 2.32
Examples of Candidate Keywords as Vertex
Evaluation Results of Restricted Relationship
方法 排名 抽取的前10个关键词 MRR
ClaimRank+
Undirected
（α = 0）		 1
2
3
4
5
6
7
8
9
10		 electrolyte_additive_composition
lithium secondary_battery
non-lithiated_additive
borate-based_lithium_compound
tetravinyl_silane
sultone-based_compound
alkyltrivinyl_silane
sulfite-based_compound
vinyl_silane-based_compound
linear_carbonate_solvent		 2.32
ClaimRank+
Undirected
（α=0.8）		 1
2
3
4
5
6
7
8
9
10		 borate-based_lithium_compound
non-lithiated_additive
non-aqueous_organic_solvent
vinyl_silane-based_compound
sulfate-based_compound
fluorocarbonate-based_compound
electrolyte_additive_composition
tetravinyl_silane
trialkylvinyl_silane
alkyltrivinyl_silane		 2.59
ClaimRank+
Directed
（α=0.8）		 1
2
3
4
5
6
7
8
9
10		 non-aqueous_organic_solvent
borate-based lithium compound
non-lithiated additive
sulfate-based compound
electrolyte additive composition
vinyl silane-based compound
fluorocarbonate-based compound
lithium secondary_battery
cyclic_carbonate_solvent
linear_carbonate_solvent		 2.72
Example of Restricted Relationship Effect Evaluation
Examples of Directed Restricted Relationship
方法 MRR
USPTO Baiten
TextRank 1.51 1.39
SingleRank 1.54 1.35
PositionRank 1.72 1.47
ClaimRank 1.99 1.86
Comparison Results of Related Methods
Example of Keyword Position in Patent
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