Quality Control
DAO has strict requirements for DAO products.
Certifications
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
Company Profile
Daoyunai Energy Saving Technology Limited
Contact Person: MrAaron Wang
