*ST Yitong: Announcement on Obtaining Invention Patent Certificate

Securities code: 300211 Securities abbreviation: *ST Yitong Announcement number: 2026-051 Jiangsu Yitong High-Tech Co., Ltd.

Announcement on Obtaining Invention Patent Certificate

The company and all members of the board of directors guarantee that the information disclosed is true, accurate and complete, and that there are no false records, misleading statements or major omissions.

Jiangsu Yitong High-tech Co., Ltd. (hereinafter referred to as the "Company" or "Yitong Technology") recently obtained an invention patent certificate issued by the State Intellectual Property Office. The form of acquisition was originally obtained by the company. The specific patent certificate details are as follows:

patent

Preface Patent Patent Authorization Patent

Patent number Patent name Term

No. Type Application Date Announcement Date Rights Limit

A Robust WiFi Fingerprint 20

1 ZL202310165399.8 Invention 2023.02.24 2026.08.11 Yitong Technology Indoor Positioning Method and System Year

The invention discloses a robust WiFi fingerprint indoor positioning method and system. The method includes: collecting the RSS value of the reference point WiFi access point, performing data enhancement on the original data after the collection is completed, and constructing a WiFi fingerprint database; using the fingerprint database to train a feature extraction module, and the neural network structure of the feature extraction module is an improved stacked denoising autoencoder. Used to extract robust features; the output of the feature extraction module is used as the input of the floor classification model and the coordinate regression model for neural network training; the RRS data of the point to be located is preprocessed and input into the feature extraction module after training is completed to obtain robust features. This feature is then used as the input of the floor classification model and the coordinate regression model to obtain the estimated position coordinates of the point to be located. The invention effectively reduces the impact of WiFi signal volatility on the accuracy of fingerprint positioning.

The acquisition of the above patents reflects the company's certain independent innovation and research and development capabilities in management control development and application technology, which is conducive to enhancing the company's core competitiveness, giving full play to the intellectual property advantages of its leading products, and is conducive to the company's formation of a continuous innovation mechanism. However, the acquisition of the above patents will not have a significant impact on the company's performance.

Announcement is hereby made.

Board of Directors of Jiangsu Yitong High-tech Co., Ltd.

September 21, 2026