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Patent applications and USPTO patent grants for Dong; Yajun.The latest application filed is for "handrail belt tension device for escalator".
Patent | Date |
---|---|
Handrail belt tension device for escalator Grant 10,745,248 - Liu , et al. A | 2020-08-18 |
Tension device for drive chain, method and escalator system using same Grant 10,457,524 - Dong , et al. Oc | 2019-10-29 |
Handrail Belt Tension Device For Escalator App 20190241405 - LIU; Lining ;   et al. | 2019-08-08 |
Tension Device For Drive Chain, Method And Escalator System Using Same App 20190071286 - DONG; Yajun ;   et al. | 2019-03-07 |
Landing cover system for escalator floor and escalator system Grant 9,487,379 - Dong November 8, 2 | 2016-11-08 |
Landing Cover System For Escalator Floor And Escalator System App 20160130118 - DONG; Yajun | 2016-05-12 |
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