Liu; Huanfeng
Patent Applications and Registrations
Patent applications and USPTO patent grants for Liu; Huanfeng.The latest application filed is for "landing-door door lock device".
- Liu; Huanfeng - Hangzhou CN
| Patent | Date |
|---|---|
| Landing-door door lock device Grant 10,189,680 - Yang , et al. Ja | 2019-01-29 |
| Landing-door Door Lock Device App 20170267495 - Yang; Yongtao ; et al. | 2017-09-21 |
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