When evaluating a company's patents and patent applications in the United States, people usually first think of finding the "authorized patent database" and "application publication database" of American patents. However, searching only in the "patentee" entrance of these two databases usually does not result in the actual patent possession of the company, that is, there are missing files in the search. Why did you miss it? This is because the data of "Authorized Patent Database" and "Application Publication Database" are only the original patentee and applicant, but after the patent application is published or authorized, the patentee may change due to patent transfer and other matters, and the data of these two databases will not change at this time, so the complete results cannot be obtained in these two databases.
In order to improve the search results and fully understand a company's patents and patent applications, we should also increase the search of "patent transfer database". The patent transfer database contains fields of transferor name and transferee name. Search from the transferor's entrance can obtain the patent transferred by the company to others, and search from the transferee's entrance can obtain the patent right or patent application right obtained by the company from others. After merging the search results of "Patent Transfer Database" with those of the first two databases, the target results can be obtained.