Section 54. (When Right of Lien May Be Exercised.) (1) Subject to the provisions of this act, the unpaid seller of goods who is in possession of them is entitled to retain possession of them until payment or tender of the price in the following cases, namely:
(a) Where the goods have been sold without any stipulation as to credit;
(b) Where the goods have been sold on credit, but the term of credit has expired;
(c) Where the buyer becomes insolvent.
(2) The seller may exercise his right of lien notwithstanding that he is in possession of the goods as agent or bailee for the buyer.
Section 55. (Lien After Part Delivery.) Where an unpaid seller has made part delivery of the goods, he may exercise his right of lien on the remainder, unless such part delivery has been made under such circumstances as to show an intent to waive the lien or right of retention.
Section 56. (When Lien Is Lost.) (1) The unpaid seller of goods loses his lien thereon (a) When he delivers the goods to a carrier or other bailee for the purpose of transmission to the buyer without reserving the property in the goods or the right to the possession thereof;
(b) When the buyer or his agent lawfully obtains possession of the goods;
(c) By waiver thereof.
(2) The unpaid seller of goods, having a lien thereon, does not lose his Hen by reason only that he has obtained judgment or decree for the price of the goods.