The BSD license does not contain any patent grants, so he can still assert the right over the use of his patent in pretty much anything - the BSD licensed code can still only be used with his permission, since you need both the copyright license and patent license to use it.
When patents are involved, it makes more sense to us a license like the GPL3 or Apache2.0, which also grant licenses for any patents which are covered by the code.
Some interpret BSD to have an implied patent grant, but the law on the subject is sparse and mostly untested. The license do say that: "Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met", but if that will be enough is up the court, and to my knowledge they have not been asked yet.
When patents are involved, it makes more sense to us a license like the GPL3 or Apache2.0, which also grant licenses for any patents which are covered by the code.