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Zelin Zhang

PD Protostar, Inc., A Delaware: 2 patents #3 of 8Top 40%
Overall (2020): #101,448 of 565,922Top 20%
2
Patents 2020

Issued Patents 2020

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
10555866 Wheeled walker wheel direction lock apparatus and method Yichuan Pan, Peter James Fellingham, David A. Purcell, David Petersen, Scott Allen Rieger 2020-02-11
D874351 Wheeled walker Peter James Fellingham, Yichuan Pan, Craig Timothy Shugert 2020-02-04