Table 1 Major studies on patent recommendations.

Studies	Contexts	Involved information						Applied techniques	Interpretability
Studies	Contexts	Texts	Categories	Citations	Inventors	Interactions	Quality	Applied techniques	Interpretability
Chen and Chiu ²⁵	C1		√					CB
Ji et al.²⁶	C1	√	√			√		Hybrid
Sooyoung Oh et al.²⁷	C1	√	√	√	√			Hybrid
Trappey et al.²⁸	C1					√		CF
Krestel and Smyth²⁹	C1	√						CB
Oh et al.³⁰	C1			√				CF
Mahdabi and Crestani³¹	C1	√	√	√	√			Hybrid
Fu et al.²³	C1	√	√	√	√	√		Hybrid
Deng et al.³²	C1	√						CB
Rui and Min³³	C1	√						CB
Chen et al.⁹	C1	√			√			CB
Trappey et al.¹²	C1	√						CB
Wang et al.⁸	C2	√	√	√	√	√		Hybrid
He et al.¹⁰	C2		√			√		Hybrid
Deng and Ma (2021)	C2	√						CB
Du et al.²²	C2	√	√	√	√	√		Hybrid
The proposed method	C2	√	√	√	√	√	√	Hybrid	√

C1 is the query-driven patent search context, C2 is the patent transfer context, CB represents content-based recommendation methods, and CF represents collaborative filtering recommendation methods.

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