Why can't "the sale income of patented technology" be recognized as income?

This mainly depends on the definition of income. Accounting "income" should be formed in the daily business activities of enterprises.

The sale of patented technology belongs to non-daily business activities, or it should belong to investment activities from the accounting point of view, so the income or loss formed by it cannot be recognized as income, but gains or losses, which are included in the non-operating income and expenditure account.