Patents by Inventor Chiao-Hu CHANG

Chiao-Hu CHANG 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).

  • Compass device
    Patent number: 11041721
    Abstract: A compass device includes a base seat, a vial unit received in an accommodation hole of the base seat, an azimuth unit rotatably sleeved around the vial unit, a first spring wire disposed to resiliently retain the vial unit to the azimuth unit for magnetic declination adjustment, and a second spring wire disposed to resiliently retain the azimuth unit to the base seat for bearing angle measurement.
    Type: Grant
    Filed: November 25, 2019
    Date of Patent: June 22, 2021
    Assignee: CHUAN CHING MECHANICAL INDUSTRIAL CO., LTD.
    Inventors: Chiao-Hu Chang, Wen-Ching Chang, Shen-Wei Chang
  • COMPASS DEVICE
    Publication number: 20210055106
    Abstract: A compass device includes a base seat, a vial unit received in an accommodation hole of the base seat, an azimuth unit rotatably sleeved around the vial unit, a first spring wire disposed to resiliently retain the vial unit to the azimuth unit for magnetic declination adjustment, and a second spring wire disposed to resiliently retain the azimuth unit to the base seat for bearing angle measurement.
    Type: Application
    Filed: November 25, 2019
    Publication date: February 25, 2021
    Applicant: CHUAN CHING MECHANICAL INDUSTRIAL CO., LTD.
    Inventors: Chiao-Hu CHANG, Wen-Ching CHANG, Shen-Wei CHANG