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There is some information about patent transfer on the website, and there will be some contact information of the patentee on it.
In addition, for the obligee who has no intention to transfer the patent, although the address of the obligee retrieved from the website of the Patent Office will not disclose their contact information, if you must obtain the contact information, you can register and inquire at the Beijing National Information Bureau and pay a certain fee.
There is no other way to know.
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