Hello, after checking that the dupont sorona trademark has not been registered, I found information about the dupont trademark on the official website of Bajie Intellectual Property. The query result is: Hongda Department Store in Shengping District, Shantou City in 1998 -01-23 Apply for a trademark named "DUPONT". The trademark passed the review of the Trademark Office on June 21, 1999 and a registration certificate was issued. The latest status is currently unavailable; the use period is 10 years in 2009- Expires on 09-20. Hope to adopt it, thank you!