Patents by Inventor Karl Hohn

Karl Hohn 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: 4520081
    Abstract: Described herein is an energy storage device which utilizes a hydrogen/bromine cell. The cell includes a bromine electrode and a hydrogen electrode. The cell is light weight, resists corrosion caused by bromine or hydrobromic acid and uses both an electrolysis and a fuel cell reaction to store or discharge electrical energy. The cell frame is made of graphite and has a pyrographite coating on at least the portion facing the bromine electrode. This cell is therefore very useful in matching varying energy supplies with varying energy demands and allows for decentralization of energy storage.
    Type: Grant
    Filed: October 28, 1983
    Date of Patent: May 28, 1985
    Assignee: Siemens Aktiengesellschaft
    Inventors: Karl Hohne, Gerd Starbeck
  • Patent number: 4367270
    Abstract: The invention relates to a method for the manufacture of diaphragms for electrochemical cells by impregnating asbestos paper with an organic plastic, and has as its principal object the development of such a method in a manner such that asbestos diaphragms which have high mechanical strength and are also cost-effective can be manufactured in efficient production. According to the invention, it is provided for this purpose to treat asbestos paper made by extrusion with a solution of polyvinylchloride or polysulfone in an organic solvent. The diaphragms prepared by the method acocrding to the invention are particularly suitable as cover layers in fuel cells with an alkaline electrolyte.
    Type: Grant
    Filed: September 9, 1980
    Date of Patent: January 4, 1983
    Assignee: Siemens Aktiengesellschaft
    Inventor: Karl Hohne
  • Patent number: 4326914
    Abstract: The invention relates to a method for the manufacture of diaphragms of fibrous potassium titanate and an organic binder for electrochemical cells and has as the object to develop such a method in such a direction that it allows the manufacture of diaphragms which are relatively thin but have, at the same time, a sufficient long-term chemical and mechanical stability at high operating temperatures. According to the invention, provision is made for this purpose to apply potassium titanate, together with polytetrafluoroethylene and a styrene-butadiene copolymer, from a suspension, to a screen with a mesh width between about 0.1 and 0.4 mm. The diaphragms made by the method according to the invention are suitable particularly as cover layers in fuel cells with an alkaline electrolyte.
    Type: Grant
    Filed: September 9, 1980
    Date of Patent: April 27, 1982
    Assignee: Siemens Aktiengesellschaft
    Inventor: Karl Hohne
  • Patent number: 4311088
    Abstract: An arrangement for producing dry flat bread, using flour, water and leaven, biologically fermenting the leaven by mixing flour and water and subsequently cooling mash. The mash is stored for 70 hours. The baking dough is also mixed from flour and water and leaven is added, before further cooling to below 12.degree. C. The dough is baked in baking plate sets. Both leaven and baking dough may be pumped through a pipeline network to successive processing stations. The arrangement comprises leaven and dough storage tanks, a mixing tank, moving containers, remote-controlled valves, a heat exchanger and a cooler, all processing stations controlled from a central control panel.
    Type: Grant
    Filed: September 27, 1979
    Date of Patent: January 19, 1982
    Inventors: Karl Hohn, Olaf Hohn, Wolfgang Hohn
  • Patent number: 4308285
    Abstract: An arrangement for producing dry flat bread, using flour, water and leaven, biologically fermenting the leaven by mixing flour and water and subsequently cooling mash. The mash is stored for 70 hours. The baking dough is also mixed from flour and water and leaven is added, before further cooling to below 12.degree. C. The dough is baked in baking plate sets. Both leaven and baking dough may be pumped through a pipeline network to successive processing stations. The arrangement comprises leaven and dough storage tanks, a mixing tank, moving containers, remote-controlled valves, a heat exchanger and a cooler, all processing stations controlled from a central control panel.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: December 29, 1981
    Inventors: Karl Hohn, Olaf Hohn, Wolfgang Hohn
  • Patent number: 4131570
    Abstract: The invention relates to a method for manufacturing a silver catalyst for electrochemical cells, wherein metallic silver is precipitated on a metal hydroxide gel by reduction of a silver salt. According to the invention, a silver-mercury alloy is precipitated on the metal hydroxide gel by simultaneous reduction of the silver salt and a mercury salt, the mercury content of the catalyst being between about 10 and 17% by weight, referred to the total weight, and the metal hydroxide content of the catalyst is preferably between about 1.5 and 2.0% by weight, referred to the silver. Catalysts prepared according to the method of this invention are particularly useful as catalysts for air electrodes of fuel cells having excellent long-term behavior.
    Type: Grant
    Filed: February 23, 1978
    Date of Patent: December 26, 1978
    Assignee: Siemens Aktiengesellschaft
    Inventor: Karl Hohne
  • Patent number: 4091175
    Abstract: An air electrode for electrochemical cells, particularly for fuel cells with an alkaline electrolyte, which contains silver coated carbon as the catalytic material in which the catalytic material also contains nickel hydroxide, the nickel content being up to about 2% by weight, with the weight ratio of silver to carbon preferably about 1:1.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: May 23, 1978
    Assignee: Siemens Aktiengesellschaft
    Inventor: Karl Hohne
  • Patent number: 3985865
    Abstract: The invention provides a method for the generation of hydrogen, particularly for the generation of hydrogen for fuel cells. The hydrogen is generated through reaction of magnesium or a magnesium-aluminum mixture with water in the presence of at least one cobalt oxide and at least one water-soluble chloride, there being additionally admixed to the reaction mixture a molybdenum compound, particularly a molybdenum oxide or a molybdenate.
    Type: Grant
    Filed: April 28, 1975
    Date of Patent: October 12, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventor: Karl Hohne
  • Patent number: 3940510
    Abstract: The invention concerns a method for the manufacture of an electrode material containing silver-coated tungsten carbide for electrochemical cells, particularly fuel cells and storage cells. Silver is precipitated on finely-divided tungsten carbide particles by reduction of a silver salt, and the tungsten carbide particles are thereby joined to form particles of larger grain size.
    Type: Grant
    Filed: September 6, 1973
    Date of Patent: February 24, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventors: Karl Hohne, Konrad Mund
  • Patent number: 3932600
    Abstract: This patent relates to a method for the generation of hydrogen, particularly for fuel cells, as well as apparatus for practicing the method. According to the invention, particles of magnesium are reacted with water in the presence of at least one cobalt oxide and at least one water-soluble chloride. Aluminum may advantageously be included with the magnesium. This abstract is neither intended to define the invention covered by this application, which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in anyway.
    Type: Grant
    Filed: September 13, 1973
    Date of Patent: January 13, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventors: Heinrich Gutbier, Karl Hohne