Declension table of pattra

Neuter	Singular	Dual	Plural
Nominative	pattram	pattre	pattrāṇi
Vocative	pattra	pattre	pattrāṇi
Accusative	pattram	pattre	pattrāṇi
Instrumental	pattreṇa	pattrābhyām	pattraiḥ
Dative	pattrāya	pattrābhyām	pattrebhyaḥ
Ablative	pattrāt	pattrābhyām	pattrebhyaḥ
Genitive	pattrasya	pattrayoḥ	pattrāṇām
Locative	pattre	pattrayoḥ	pattreṣu

Compound pattra -

Adverb -pattram -pattrāt