Haojie LI

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Lishui, CN

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Patents Grantslast 30 patents

Information Patent Grant
Electromagnetic release door closer
- Patent number 10,641,020
- Issue date May 5, 2020
- Oubao Security Technology Co., Ltd.
- Haojie Li
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Concealed door closer
- Patent number 9,145,726
- Issue date Sep 29, 2015
- Oubao Security Technology Co., Ltd.
- Haojie Li
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES

Patents Applicationslast 30 patents

Information Patent Application
ELECTROMAGNETIC RELEASE DOOR CLOSER
- Publication number 20170306668
- Publication date Oct 26, 2017
- Oubao Security Technology Co., Ltd.
- Haojie LI
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Application
CONCEALED DOOR CLOSER
- Publication number 20140304942
- Publication date Oct 16, 2014
- Oubao Security Technology Co., Ltd.
- Haojie LI
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES