46 CAP. 400] Patents entitled to receive, directly or indirectly from any Government department in respect of the invention in question. (As amended by S.l. No. 175 of 1965 and Act No. 18 of 1980) PART VI SPECIAL PROVISIONS RELATING TO SPECIFICATIONS, ANTICIPATION AND RIGHTS IN INvENTIONS Amendment of specifica­ tion by Registrar 43. (l) An applicant for a patent or a patentee may, at any time by request in writing lodged at the Patent Office, seek leave to amend either his provisional or his complete specification, including draw­ ings forming part thereof, and shall in making any such request state the nature of the proposed amendment and the reasons therefor. (2) Where there are joint applicants or patentees, the request shall be made by them jointly or by one or more of them with the written consent of the other or others, and in the case of disagreement between them the Registrar may, if satisfied that one or more of them should be allowed to proceed alone and subject to such conditions as he may impose, permit the request to be made without the consent of the others: Provided that all parties interested shall be notified by the appli­ cant of the request and be entitled to be heard before any decision is given thereon. (3) An amendment of an accepted complete specification shall be allowed only if it is by way of disclaimer, correction or explanation, and no amendment of any specification, except by way of correcting an obvious mistake, shall be allowed if the result would be that the specification as amended would claim or describe matter not in sub­ stance disclosed in the specification before amendment, or would include any claim not wholly within the scope of a claim included in the specification before amendment. (4) The request for an amendment of an accepted complete spec­ ification and its nature shall be advertised by the applicant in the pre­ scribed manner, and at any time within three months of the adver­ tisement, or such further time as the Registrar, subject to such condi­ tions as he may impose, may allow, any person may give notice at the Patent Office of opposition to the amendment. (5) Notice of opposition shall be given in the prescribed manner to the Registrar and to the person making the request, and the Registrar shall hear the person making the request and the person who has given notice of opposition and determine whether and sub­ ject to what conditions. if any, the amendment ought to be allowed.