SUSTAINABLE BIO-CHAR-BASED INK HAVING CONDUCTIVE PROPERTIES
us application:
https://patentscope.wipo.int/search/en/detail.jsf?docId=US309776850&_cid=P10-KHLJBZ-97264-1
worldwide application:
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2020220047&tab=PCTBIBLIO&_cid=P10-KHLJBZ-97264-1
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