Quality

DAO has strict requirements for DAO products.

 

Standard: Utility Model Invention Patent Number: 7588156 Issue Date: 2017-10-26 Expiry Date: 2027-10-25 Scope/Range: Trenchless pipe repair UV cure Issued By: State Intellectual Property Office

Standard: Utility Model Invention Patent Number: 6707592 Issue Date: 2016-12-05 Expiry Date: 2026-12-04 Scope/Range: Trenchless pipe repair CCTV Issued By: State Intellectual Property Office

Standard: INTELLECTUAL PROPERTY MANAGEMENT SYSTEM CERTIFICATION Number: 41920IP00045-04R0S Issue Date: 2020-04-29 Expiry Date: 2023-04-28 Scope/Range: Production and sales of pipeline inspection and trenchless repair equipment intellectual property management involved in the R&D Issued By: HUAYI certificate center

Standard: Utility Model Invention Patent Number: 4055846 Issue Date: 2014-09-15 Expiry Date: 2024-09-14 Scope/Range: Trenchless pipe CCTV crawler Issued By: State Intellectual Property Office