25. Amendment of section 28.-In section 28 of the principal Act,- (a) for sub-section (4), the following sub-section shall be substituted, namely:-
"(4) A request or claim under the foregoing provisions of this section shall be made before the grant of patent.";
(b) sub-section (5) shall be omitted;
(c) in sub-section (6), for the words, brackets and figure "Subject to the provisions of sub-section (5), where", the word "Where" shall be substituted.
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