I believe Antique Airplane Association may own Type Certificate A-748 to the L-AR-90, and Lark 95. AAA did rescue the remains of Spinks aircraft. Spinks acquired the type certificate from Helton, who acquired it from Lark Aircraft, who obtained it from California Aero, who acquired it from Superior, who acquired it from Culver (to the best of my memory and knowledge). I am uncertain if the FAA would consider the Antique Airplane Association the legitimate owner of the type certificate, and if the AAA actually obtained ownership of the type certificate, or just the Spinks' remains.
I believe the lineage of the type certificates for all other Culver models ends with Superior Aircraft (except for the PQ-8A which became the Jamieson J-1, and the Dart series which went to Applegate-Weyant, then Dart Aircraft Corporation). I'm not sure it will be so easy getting the FAA to admit that the type certificates are orphaned.