Patents by Inventor Lambertus H. Princen

Lambertus H. Princen 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).

  • Specimen holder and technique employed to effect a continuous maximum concentration gradient in critical point drying
    Patent number: 4003135
    Abstract: The present device and technique enables a small specimen to be subject to a continuous maximum concentration gradient by continually replenishing the fluid coming in contact with the specimen. Accordingly, the diffusion rate from the specimen to the fluid in contact is maintained at a high level, and the fluid-exchange steps are completed quickly. Further, the device is designed to hold a plurality of specimens so that a number of specimens can be "dried" simultaneously and quickly.
    Type: Grant
    Filed: June 13, 1975
    Date of Patent: January 18, 1977
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Frederick L. Baker, Lambertus H. Princen