i have a few patents overseas and some in the usa. if u decide to pursue it, i’d start by quickly calling all the patent attorneys in the phone book and online in your area and asking for their price.
i called about 60-80 different ones until i found a real cheap and good one. most prices on patent are minimum $1500-5000. i found someone to do it for $600. most patents like your describing can be easily bypassed by a simple modification anyways. it’s usually only beneficial for major corporations to deal with patents in the usa.