Patents by Inventor Duane Hammond

Duane Hammond 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).

  • Double seat valve with a controlled leakage cavity
    Patent number: 5775363
    Abstract: The invention relates to a double seat valve with a controlled leakage cavity according to the preamble of claim 1. It is an object of the present invention to create favorable conditions for complying, in most points, with the so-called US-American 3A standards and FDA regulations. This object is achieved inter alia by providing between the sealing places (7, 8; 70, 71) a penetration cross-section (6a) from the inside space of the valve casing parts (1, 2) to the leakage cavity which at least corresponds to the nominal cross-section of the double seat valve and by using the same dimensions for the connection via the leakage cavity (6) and between the leakage cavity and the environs of the double seat valve.
    Type: Grant
    Filed: August 15, 1996
    Date of Patent: July 7, 1998
    Inventor: Duane Hammond