Patents by Inventor Fred Petersen

Fred Petersen 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).

  • Method for introducing oxygen into water and an apparatus for implementing the said method
    Patent number: 4780217
    Abstract: The invention relates to a method for restoring bodies of water by artificial aeration of the deep water (the hypolimnion), whereby the natural stratification of the water is maintained and no compressor is required. A pump draws the deep water in and forces it through an ejector which, in turn, draws air from the atmosphere and mixes it, in the form of finely divided bubbles, with the water. The mixture of water and air is injected into a riser-pipe in which the ascending air-bubbles produces an upwardly directed vertical flow, additional deep water being drawn in through the opening at the bottom of the riser-pipe and being brought into contact with the air-bubbles. At the top, residual air can escape into the atmosphere through the opening at the top of the riser-pipe, or through a degasification link connected thereto, whereas oxygen enriched water can be passed through a downpipe back to the hypolimnion.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: October 25, 1988
    Inventor: Fred Petersen
  • Rudder rotor for watercraft and floating equipment
    Patent number: 4535714
    Abstract: The invention relates to an electric rudder rotor which in its simplest construction is in the form of an externally running underwater electric motor and comprises a fixed stator and a rotating rotor, which carries the rotor cylinder, the stator being supplied with electric current and the rotor being rotated by magnetic interaction between the stator and the rotor.
    Type: Grant
    Filed: October 31, 1979
    Date of Patent: August 20, 1985
    Assignee: Firma Jastram-Werke GmbH KG
    Inventor: Fred Petersen
  • Method for producing a thrust in manoeuvering engines for a watercraft and a manoeuvering engine constructed for the same
    Patent number: 4316721
    Abstract: The invention relates to a method for producing a thrust in manoeuvering engines for watercraft and a manoeuvering engine constructed for the same, whereby the method comprises the annular driving water jet supplied to the diffuser and enveloping a first suction water jet is fed to a second suction water jet supplied to the diffuser inner wall surface, while the manoeuvering engine is constructed in such a way that the rear part of the engine casing is provided with an inlet port having a smaller diameter than the outlet port and located in the vicinity of the outlet port of the front engine part, whereby for the optimum adaptation of the exit mixing jet velocity to the vehicle speed a water jet exit cross-section regulating device is provided.
    Type: Grant
    Filed: July 14, 1978
    Date of Patent: February 23, 1982
    Assignee: Jastram-Werke GmbH KG
    Inventors: Friedrich Weiss, Fred Petersen