Patents by Inventor Wai Kei Cheung

Wai Kei Cheung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Jewelry alloy
    Patent number: 11268174
    Abstract: This invention provides a jewelry alloy which improves mechanical properties of AuIn2 while preserving its attractive blue hue. In one embodiment, said mechanical properties comprises fracture toughness and hardness. In one embodiment, said jewelry alloy consist essentially of 43.0 to 49.0 wt % Au; 51.0 to 57.0 wt % In; 0.001 to 1.0 wt % of one or more elements selected from the group consisting of Fe and Ge; and 0.001 to 1.0 wt % of one or more elements selected from the group consisting of Rh, Ir and Ru.
    Type: Grant
    Filed: July 22, 2021
    Date of Patent: March 8, 2022
    Assignee: CHOW SANG SANG JEWELLERY COMPANY LIMITED
    Inventors: Wai Kei Cheung, Shuk Kwan Mak, Mei Tsz Macy WONG
  • Platinum electrodeposition bath and uses thereof
    Patent number: 10612149
    Abstract: This invention relates to a platinum electrodeposition bath which is capable of forming platinum deposits having an attractive shiny granular surface like a velvet, which is particularly useful in jewelry manufacturing. The velvet effect can be illustrated by comparing the surface roughness with a bright smooth platinum deposit.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: April 7, 2020
    Assignee: CHOW SANG SANG JEWELLERY COMPANY LIMITED
    Inventors: Wai Kei Cheung, Shuk Kwan Mak, Candice Wing Jong Tong