I understand that the "submarine patent" here is not "patented technology used in submarines", but refers to a patented operation form that matches market interests.
If this is the case, then submarine patents usually refer to "in some patent applications, based on specific purposes, the patent acceptance and approval process is used to control the timing of patent disclosure or authorization." Such patents It's the so-called "submarine patent."
The reason for this name is from the perspective of competitors: such a patent is suddenly announced or authorized at a critical moment, just like a submarine suddenly emerging from the bottom of the water, causing the opponent to be unable to catch up. .