400. Agreements for sale.

400.     Agreements for sale.

Agreements as to the sale of a patent1, or any interest in a patent, need not be in writing2, and may be enforced in the ordinary way by an order for specific performance3 or, in the case of an agreement for sale made before grant of the patent4, by applying to the comptroller5 for a direction that the application proceed in the name of the purchaser6.