First, the patent transfer time:
You can get the certificate about 1-3 months after submitting the materials for patent transfer.
Second, the patent transfer matters needing attention:
1. Before the signing of the transfer contract, the assignor has already exploited the patent, and the transfer contract may stipulate that after the signing of the transfer contract takes effect, the assignor may continue to exploit or stop exploiting the patent. If there is no agreement in the contract, the transferor shall stop exploiting the patent.
2. Before the signing of the transfer contract, the rights and obligations of the licensing contract that the transferor has licensed others to implement shall be transferred to the transferee from the effective date of the signing of the transfer contract.