Patents by Inventor Alphonsus G. W. M de Jongh

Alphonsus G. W. M de Jongh 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).

  • Light guide for liquid detection and cable comprising such a guide
    Patent number: 4596443
    Abstract: A glass-fibre cable has been provided with a signalling conductor for signalling liquid which has penetrated into the cable sheath. The signalling conductor is a glass fibre, which is inserted in a protective perforated sheath in the usual way. The inner periphery of this sheath is provided with a wave-shaped pattern on one side, whereas the opposite side is provided with a layer of swelling powder. As soon as the liquid which has entered the cable, reaches the swelling powder, the volume of this swelling powder will considerably increase, in consequence of which the glass fibre will be pressed against the wave-shaped pattern. This causes microbending which involves a strong, measurable attenuation of the light signal transmitted through the glass fibre. The swelling powder can be applied to a substrate.
    Type: Grant
    Filed: April 18, 1985
    Date of Patent: June 24, 1986
    Assignee: Staat der Nederlanden (Staatsbedrifj der Posterijen, Telegrafie en Telefonie)
    Inventors: Martinus B. J. Diemeer, Alphonsus G. W. M de Jongh