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(1) A change in the ownership of a patent, or the registration of a utility model certificate, or an application for a patent or a utility model certificate, shall be in writing.

(2) At the request of an interested party, the Registrar shall record the fact of the change and, except in the case of an application, the Registrar shall publish the change in the prescribed manner.

(3) The change shall have no effect against third parties until it has been recorded.

(4) A licence contract concerning a patent or a registered utility model certificate, or an application shall be submitted to the Registrar who shall keep its contents confidential but shall record it and publish a reference to it in the prescribed manner.

(5) The licence contract shall have no effect against third parties until it has been recorded.