Can a patent be sold to two companies at the same time?

One is the transfer of patent right, and the other is the license of patent exploitation. I don't know which one you mean. If it is a transfer, it can only be transferred to one party, not to many parties. Permission is divided into:

(1) exclusive exploitation license: the patentee may not exploit the patent by himself;

(2) Exclusive exploitation license: the patentee has the right to exploit the patent by himself;

(3) General implementation license:

(4) Cross-licensing:

(5) Sub-licensing.

Among them, exclusive license and exclusive license cannot be licensed by multiple parties.