Paragraph 1 Invalidity of the certificate
The certificate shall be invalid if:
(a)
it was granted contrary to the provisions of Article 3;
(b)
the basic patent has lapsed before its lawful term expires;
(c)
the basic patent is revoked or limited to the extent that the product for which the certificate was granted would no longer be protected by the claims of the basic patent or, after the basic patent has expired, grounds for revocation exist which would have justified such revocation or limitation.