Patents by Inventor Hilda B. Hjalmarson

Hilda B. Hjalmarson 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).

  • Mixing apparatus for test tubes
    Patent number: 5501521
    Abstract: Devices and methods for the mixing of liquid samples which comprise means for performing the mixing, including a resting phase during the mixing cycle.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: March 26, 1996
    Inventor: Hilda B. Hjalmarson