Patents by Inventor John-Sea Chen

John-Sea Chen 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).

  • Patent number: 4897152
    Abstract: The invention provides an etchant and a method of using the etchant for revealing dislocations on low index planes in group II-VI compounds such as (Hg.sub.x Cd.sub.(1-x))Te. The etchant has a composition proportional to 80 ml water, 10 ml of hydrochloric acid, 20 ml of nitric acid, and 8 gm of potassium dichromate. In another embodiment, the concentration of nitric acid is reduced to 0%. The surface of the compound being examined is exposed to the etchant for about 20 second to 6 minutes depending upon the crystallographic plane being examined. The surface is then rinsed in water. For the {111}B plane, additional rinses in a 0.05% solution of bromine in methanol and methanol are used.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: January 30, 1990
    Assignee: Rockwell International Corporation
    Inventor: John-Sea Chen