Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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B01D
SEPARATION
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71/00
Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
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B01D71/58
Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
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B01D71/62
Polycondensates having nitrogen-containing heterocyclic rings in the main chain
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B01D71/64
Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
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