How to deal with the patent application right transfer contract after it is declared invalid?

After the contract for the transfer of the right to apply for a patent is declared invalid, the property obtained from the contract shall be returned. However, the specific forms of return include unilateral anti-return and bilateral return. As far as this case is concerned, since the patent application right transfer contract is a free transfer, its return form should belong to unilateral return, that is, only the transferee can return the patent application right to the transferor. Legal basis: Article 567 of the Civil Code of People's Republic of China (PRC). The termination of contractual rights and obligations shall not affect the validity of the settlement and liquidation clauses in the contract. Article 577 Where a party fails to perform its contractual obligations or fails to perform its contractual obligations in conformity with the contract, it shall be liable for breach of contract such as continuing to perform, taking remedial measures or compensating for losses. Article 578 Where a party expressly expresses or shows by his own behavior that he will not perform his contractual obligations, the other party may require him to bear the liability for breach of contract before the time limit for performance expires. Article 579 If one party fails to pay the price, remuneration, rent or interest, or fails to perform other monetary obligations, the other party may demand payment.