Limitation and exemption conditions defeated an excise duty refund, and no restitutionary claim was proved.

Excise duty refund was rejected as time-barred because the claim was filed after the six-month limitation period from the last payment had expired. The assessee also failed to establish entitlement to exemption under Notification No. 198/76, since the record showed no manufacturing activity during the fixed base period and no compliance with the notification conditions. The Court further held that a refund could not be claimed on the basis of mistake of law or restitution without proof of a common mistake and resulting injury. The challenge to the refund rejection therefore failed, and no return of duty was ordered.

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Issues: (i) Whether the refund claim of excise duty was barred by limitation; (ii) Whether the petitioner was entitled to exemption under Notification No. 198/76 on the facts of the case; (iii) Whether refund could be claimed on the basis of mistake of law and restitution.

Issue (i): Whether the refund claim of excise duty was barred by limitation.

Analysis: The refund application related to duty paid for the period from 14 May 1977 to 31 March 1978, but the claim was filed only on 2 April 1979. On the Court's calculation, the prescribed period of six months from the last payment had expired well before the application was made. The rejection of the claim on limitation was therefore held to be justified.

Conclusion: The refund claim was barred by limitation and the rejection on that ground was upheld.

Issue (ii): Whether the petitioner was entitled to exemption under Notification No. 198/76 on the facts of the case.

Analysis: The notification required fixation of a base period and contemplated production during that base period. The record showed that there was no manufacturing activity at all during the base period fixed by the Collector. The Court found no material showing compliance with the conditions of the notification or entitlement to its benefits.

Conclusion: The petitioner was not entitled to exemption under the notification.

Issue (iii): Whether refund could be claimed on the basis of mistake of law and restitution.

Analysis: The Court held that ignorance of law is distinct from mistake of law, and that a restitutionary claim requires proof that the payment was made under a common mistake and that the payer suffered injury. No such averment or proof was shown, and no basis for restitution was established on the facts.

Conclusion: No refund was allowable on the basis of mistake of law or restitution.

Final Conclusion: The challenge to the refund rejection failed in entirety, and the duty amount was not ordered to be returned.

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