Patents by Inventor Krause Friedemann

Krause Friedemann 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).

  • Liquid dispensing method and device
    Patent number: 7439076
    Abstract: A method of pipetting an accurate quantity of liquid comprising the steps of drawing water into a pipetting chip (2) from a liquid container (8), drawing air into said tip first slowly at a first rate and then quickly at a second rate to turn said drawn water into a mist of drops in said tip (2) and increase the relative humidity of the air in said tip (2), waiting a preset time period, and drawing a tested liquid into said tip (2). This makes the quantity of vapor of the tested liquid in said tip (2) very small and constant and thus the accurate quantity of tested liquid can be pipetted.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: October 21, 2008
    Assignees: Hitachi, Ltd., Roche Diagnostics Operations, Inc.
    Inventors: Yukie Tokiwa, Kyoko Imai, Lotterer Siegfried, Krause Friedemann