Giving its verdict on an appeal by Tata Motors Ltd, a division bench comprising Justices Pinaki Chandra Ghosh and Mrinal Kanti Chaudhury observed that the President's assent had not been taken for the Act and as such it was void and unconstitutional.
The implementation of the order was, however, stayed for two months by the division bench to allow the aggrieved party to appeal before a higher court.
The division bench set aside the order of Justice I P Mukerji who had held the Act to be constitutional.
It observed that the single bench had no jurisdiction to fill up loopholes left by the legislature.
The court also observed that what was done in Singur was acquisition of land by the said Act and as such it was void.
Tata Motors had challenged the order of the single bench of the Calcutta High Court, which had upheld the Singur Land Rehabilitation and Development Act, 2011, by which the West Bengal government vested the land leased to the company at Singur, before the division bench of the court.
Tata Motors had appealed against the order of Justice Mukerji, which was passed on September 28, last year.
Justice Mukerji had held the Singur Land Rehabilitation and Development Act 2011 to be constitutional.
The court had, however, ordered on September 28 an unconditional stay of the judgement till November two to allow any aggrieved party to file an appeal, if it so desired.
Tata Motors had been leased 997 acres at Singur in Hooghly district, about 40 km from here, by the previous Left Front government for its Nano car project, billed as the cheapest car.