Patents by Inventor Cheng-San Chiang

Cheng-San Chiang 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).

  • Low level alarm for drop-feed injection liquid
    Patent number: 4931777
    Abstract: A low level alarm device for drop-feed injection liquid comprises a mechanical arrangement where an injection liquid containing bottle is hung on one arm of a mechanical balance to be balanced by a counter weight provided on the other arm of the balance. The consumption of the liquid in the bottle causes the loss of equilibrium of the balance thereby triggering a circuit to be closed to sound an alarm so that the liquid may be replenished in time by an attendant.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: June 5, 1990
    Inventor: Cheng-San Chiang