Patents by Inventor Helmuth Holzel

Helmuth Holzel 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).

  • Patent number: 5040312
    Abstract: A drying apparatus for drying gels and biological substances has a base with a drying area, surrounded by a sealing surface, for receiving the substance to be dried and a cover, whose marginal area can be placed in vacuum-tight manner on the sealing surface and the drying space formed between the drying area and the cover can be evacuated. In order to achieve a good and reliable sealing of the drying space and to prevent the penetration of ambient air into the latter, the sealing surface in the cover bearing area and/or the marginal area of the cover resting on the sealing surface are constructed in rubber-elastic manner and at least one closed evacuatable groove is formed in the sealing surface. The cover rests on the sealing surface on either side of the groove.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: August 20, 1991
    Inventor: Helmuth Holzel