Excise duty on non-manufacture process, refund limitation, and unjust enrichment require proof before denying restitution.

Converting phenolic resin into phenolic moulding powder is treated as a physical modification, not a new and distinct product, so the process is not manufacture and does not attract excise duty. Where duty is collected under a mutual mistake of fact and law, refund cannot be denied merely because the claim relates to an earlier period, as limitation under Section 11B does not bar restitution of duty collected without authority of law. A plea of unjust enrichment also fails unless the Department proves that the duty burden was actually passed on to consumers.

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Issues: (i) whether the process of converting phenolic resin into phenolic moulding powder amounted to manufacture attracting excise duty, (ii) whether refund of duty collected under a mutual mistake could be denied on the ground of limitation, and (iii) whether refund was barred by unjust enrichment.

Issue (i): whether the process of converting phenolic resin into phenolic moulding powder amounted to manufacture attracting excise duty.

Analysis: The later departmental circular and governmental decision treated the conversion of phenolic resin into phenolic moulding powder as a physical modification and not as a process creating a new or distinct product. On that basis, the duty collected on the modified resin had been without authority of law, and the earlier controversy over exemption notifications had become academic.

Conclusion: The process was not manufacture and was not liable to excise duty.

Issue (ii): whether refund of duty collected under a mutual mistake could be denied on the ground of limitation.

Analysis: The duty had been paid and collected under a mutual mistake of fact and law, and the mistake was discovered only when the departmental circular and governmental decision were issued. In such circumstances, the Court held that refund could not be refused merely because the claim covered an earlier period, and the bar of limitation under Section 11B was not applicable to deny restitution of duty collected without authority.

Conclusion: Refund could not be denied on limitation and the assessee was entitled to claim refund for the entire period.

Issue (iii): whether refund was barred by unjust enrichment.

Analysis: The Department did not place material to show that the entire burden of duty had in fact been passed on to consumers. The Court followed the principle that unjust enrichment cannot be presumed in the absence of supporting facts and that retention of money collected without authority cannot be justified merely because the State has already spent it.

Conclusion: The plea of unjust enrichment failed and refund was payable to the assessee.

Final Conclusion: The petition succeeded, the impugned orders stood vacated, and the Department was directed to process and grant refund of the duty recovered without authority of law.

Ratio Decidendi: Duty collected without authority of law on a process that does not amount to manufacture must be refunded, and such restitution cannot be defeated merely by limitation or by a bare plea of unjust enrichment without proof that the tax burden was actually passed on.

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