Article 139
(1) If it is decided that a patent is invalid, the results of the decision take effect retroactively and protection provided by this Act for patent or patent application shall be deemed as null and void.
(2) Without prejudice to compensation demands of sufferers caused by patent owner’s gross negligence or bad intention, retroactive effect of invalidity shall not affect situations specified below.
a) Decisions given, legally finalized and implemented due to infringement on rights provided by patents prior to the decision regarding the invalidity of patent is given,
b) Contracts concluded and implemented prior to the decision regarding the invalidity of patent is given,
(3) Pursuant to contract specified subparagraph (b) of second paragraph, partly or wholly return of paid price may be requested on an equitable basis.
(4) The final decision regarding the invalidity of patent shall bind everyone. After the finalization of the invalidity decision, the court notifies this decision to the Office ex-officio.
Patent that is revoked by final judgment shall be cancelled from the register by the Office and this state shall be published in the Bulletin.