Patent classifications
A
HUMAN NECESSITIES
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A61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
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A61K
PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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31/00
Medicinal preparations containing organic active ingredients
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A61K31/74
Synthetic polymeric materials
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A61K31/785
Polymers containing nitrogen
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A61K31/787
containing heterocyclic rings having nitrogen as a ring hetero atom
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A61K31/79
Polymers of vinyl pyrrolidone
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