As used in this chapter:

1. (a) “Grain” includes barley, corn, flax, hay, grain sorghums, oats, rice, rye, and wheat.
2. (b) “Seller” means a producer of grain who continues to store grain after sale thereof by him in storage facilities owned, operated, or controlled by him.
3. (c) “Storage facilities” means any bin, building, elevator, protected enclosure, or other structure owned, operated, or controlled by the seller of the grain stored therein.
4. (d) “Private bulk storage” means the storage of grain in storage facilities after sale of such grain by a seller.
5. (e) “Buyer” means a purchaser of grain which is thereafter stored in private bulk storage, and includes the assigns and successors in interest of such buyer.
6. (f) “Bill of sale” means a written instrument, conforming to the requirements of this chapter, which evidences a transfer of grain.