I am looking for methods to make N,O-carboxymethyl chitosan. I have found one in an expired US patent and another in a 20 year old journal article. Just wondering if anyone knows of more recent published methods or could forward a copy. Thanks!
I am looking for methods to make N,O-carboxymethyl chitosan. I have found one in an expired US patent and another in a 20 year old journal article. Just wondering if anyone knows of more recent published methods or could forward a copy. Thanks!
Do any patents reference the expired one?
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