When was the national patent technology of extracting Lycium barbarum oil and Lycium barbarum seed oil by over-age supercritical carbon dioxide issued?

In 2003. Carbon dioxide is a common compound in the air. Carbon reacts with oxygen to produce its chemical formula: Co2. A carbon dioxide molecule consists of two oxygen atoms and one carbon atom through valence bond. In August, 2003, the company applied for the technology of keeping fresh Lycium barbarum juice at room temperature and the production method of extracting Lycium barbarum seed oil by supercritical carbon dioxide, and obtained the national invention patent certificate. So in 2003, the patent mainly refers to the patent right, which is an exclusive right, and refers to the invention and creation filed by the national patent examination and approval authority.