Patents by Inventor Lutz Riefenstein

Lutz Riefenstein 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: 11622648
    Abstract: Disclosed are cooking methods using inspection systems including: a distance sensor and a digital optical recognition device. The distance sensor detects the position of the food product placed in the cooking device and the digital optical recognition device captures a series of images for the purpose of food product recognition. Once the food product is recognized, the operator is provided with the correct cooking cycle/program for the position and type of food product placed in the cooking device. The methods also ensure that the food product has been properly cooked at the end of the cooking cycle/program. The methods ensure: (1) the food product is correctly recognized; (2) the cooking cycle/program is correctly selected; (3) the correct cooking cycle/program is followed to completion; and (4) the quality of the cooked food product meets expected standards.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: April 11, 2023
    Assignee: CONVOTHERM ELEKTROGERATE GMBH
    Inventor: Lutz Riefenstein
  • Patent number: 10154749
    Abstract: Disclosed is a cooking device with optical identification means for identifying food to be cooked. A motion detector is provided to activate the optical identification means. The motion detector may also activate a light source for lighting the field of vision of the optical means. Optical identification is controlled by the outer appearance of the food. A controller accesses a physical feature database and compares previously stored picture data to the physical features of the food to be cooked. The controller calculates a matching probability rank between the stored picture data and the food to be cooked. The controller is also programmed to have a learning ability for recognizing a previously unknown food product. Based upon the identification of the food product to be cooked, the cooking device starts the recipe for cooking the food product.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: December 18, 2018
    Assignee: CONVOTHERM ELEKTROGERAETE GMBH
    Inventor: Lutz Riefenstein
  • Patent number: 9964311
    Abstract: A cleaning system for cleaning a cavity of food or beverage preparation device. The cavity is connected with a pipe system. The pipe system supplies a fluid through the pipe system to the cavity. When the fluid flow stops, any remainder of the fluid in the pipe system is removed by passing a gas (for example, air) through the pipe system or by a valve disposed at a high location of the pipe system.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: May 8, 2018
    Assignee: CONVOTHERM ELEKTROGERAETE GMBH
    Inventors: Martin Behle, Lutz Riefenstein, Hannes Wild, Guenter Wurdinger
  • Patent number: 9775459
    Abstract: A cooking device comprising a first interior chamber, a second interior chamber being fluidly connected with the first interior chamber via a drain and comprising a first water reservoir, the drain and the first water reservoir forming a first air trap, and a device outlet downstream of the second interior chamber, whereby said air trap is adapted to be opened or closed by lowering or lifting the first water reservoir between the first interior chamber and the second interior chamber.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: October 3, 2017
    Assignee: Convotherm Elektrogeraete GmbH
    Inventors: Guenter Wurdinger, Hannes Laessig, Lutz Riefenstein
  • Publication number: 20170079471
    Abstract: Disclosed are cooking methods using inspection systems including: a distance sensor and a digital optical recognition device. The distance sensor detects the position of the food product placed in the cooking device and the digital optical recognition device captures a series of images for the purpose of food product recognition. Once the food product is recognized, the operator is provided with the correct cooking cycle/program for the position and type of food product placed in the cooking device. The methods also ensure that the food product has been properly cooked at the end of the cooking cycle/program. The methods ensure: (1) the food product is correctly recognized; (2) the cooking cycle/program is correctly selected; (3) the correct cooking cycle/program is followed to completion; and (4) the quality of the cooked food product meets expected standards.
    Type: Application
    Filed: December 2, 2016
    Publication date: March 23, 2017
    Inventor: Lutz Riefenstein
  • Patent number: 9538880
    Abstract: Disclosed are cooking devices having inspection systems including: a distance sensor and a digital optical recognition device. The distance sensor detects the position of the food product placed in the cooking device and the digital optical recognition device captures a series of images for the purpose of food product recognition. Once the food product is recognized, the operator is provided with the correct cooking cycle/program for the position and type of food product placed in the cooking device. The inspection systems also ensure that the food product has been properly cooked at the end of the cooking cycle/program. The inspection systems ensure: (1) the food product is correctly recognized; (2) the cooking cycle/program is correctly selected; (3) the correct cooking cycle/program is followed to completion and (4) the quality of the cooked food product meets expected standards.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: January 10, 2017
    Assignee: CONVOTHERM ELEKTROGERAETE GMBH
    Inventor: Lutz Riefenstein
  • Patent number: 9326632
    Abstract: A valve structure includes a housing having an interior chamber, a first conduit connecting the interior chamber with a cooking chamber of a cooking device and having a first discharge cross-section, a second conduit connecting the interior chamber with the outside environment and having a second discharge cross-section, and at least one valve seat within the interior chamber having at least one valve seat opening which cooperates with at least one valve disc. The at least one valve disc moves between a closed position on the valve seat opening, and an open position spaced apart from the valve seat opening by changes in pressure in the cooking chamber. The valve operates to allow bidirectional flow of fluid to relieve over pressure and underpressure conditions, and enables automatic balancing of low pressure or vacuum in the cooking chamber.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: May 3, 2016
    Assignee: CONVOTHERM ELEKTROGERAETE GMBH
    Inventors: Lutz Riefenstein, Guenter Wurdinger
  • Publication number: 20150059807
    Abstract: A cleaning system for cleaning a cavity of food or beverage preparation device. The cavity is connected with a pipe system. The pipe system supplies a fluid through the pipe system to the cavity. When the fluid flow stops, any remainder of the fluid in the pipe system is removed by passing a gas (for example, air) through the pipe system or by a valve disposed at a high location of the pipe system.
    Type: Application
    Filed: December 14, 2012
    Publication date: March 5, 2015
    Inventors: Martin Behle, Lutz Riefenstein, Hannes Wild, Guenter Wurdinger
  • Publication number: 20140290500
    Abstract: A cooking device comprising a first interior chamber, a second interior chamber being fluidly connected with the first interior chamber via a drain and comprising a first water reservoir, the drain and the first water reservoir forming a first air trap, and a device outlet downstream of the second interior chamber, whereby said air trap is adapted to be opened or closed by lowering or lifting the first water reservoir between the first interior chamber and the second interior chamber.
    Type: Application
    Filed: July 25, 2011
    Publication date: October 2, 2014
    Applicant: Convotherm Elecktrogerate GmbH
    Inventors: Guenter Wurdinger, Hannes Laessig, Lutz Riefenstein
  • Publication number: 20140026762
    Abstract: Disclosed is a cooking device with optical identification means for identifying food to be cooked. A motion detector is provided to activate the optical identification means. The motion detector may also activate a light source for lighting the field of vision of the optical means. Optical identification is controlled by the outer appearance of the food. A controller accesses a physical feature database and compares previously stored picture data to the physical features of the food to be cooked. The controller calculates a matching probability rank between the stored picture data and the food to be cooked. The controller is also programmed to have a learning ability for recognizing a previously unknown food product. Based upon the identification of the food product to be cooked, the cooking device starts the recipe for cooking the food product.
    Type: Application
    Filed: November 14, 2011
    Publication date: January 30, 2014
    Applicant: Convotherm Elekktrogeraete GmbH
    Inventor: Lutz Riefenstein
  • Patent number: 8609167
    Abstract: The disclosure is a method of operating a commercial cooking equipment, in particular a hot-air steamer or fan oven, comprising the following method steps: a) selecting a product requiring cooking having an assigned cooking program or selecting at least one cooking parameter having assigned selectable products; b) loading the cooking equipment with a selected product; c) starting the associated cooking program; d) displaying the name of the program and at least the remaining cooking time; e) associating in automated manner further products or cooking programs that fit in with the cooking program of the first selected product in dependence on cooking parameters, in particular, the cooking temperature and/or the cooking humidity and/or the fan speed; f) displaying the selectable products or selectable cooking programs; g) selecting, on demand, a further product which matches the first product in accordance with the associating process; h) loading the cooking equipment with the further product; i) starting the
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: December 17, 2013
    Assignee: Convotherm Elektrogerate GmbH
    Inventors: Markus Ernst, Lutz Riefenstein
  • Publication number: 20130302483
    Abstract: Disclosed are cooking devices having inspection systems including: a distance sensor and a digital optical recognition device. The distance sensor detects the position of the food product placed in the cooking device and the digital optical recognition device captures a series of images for the purpose of food product recognition. Once the food product is recognized, the operator is provided with the correct cooking cycle/program for the position and type of food product placed in the cooking device. The inspection systems also ensure that the food product has been properly cooked at the end of the cooking cycle/program. The inspection systems ensure: (1) the food product is correctly recognized; (2) the cooking cycle/program is correctly selected; (3) the correct cooking cycle/program is followed to completion and (4) the quality of the cooked food product meets expected standards.
    Type: Application
    Filed: May 3, 2013
    Publication date: November 14, 2013
    Applicant: Convotherm Elektrogeraete GMBH
    Inventor: Lutz Riefenstein
  • Publication number: 20130192473
    Abstract: Disclosed is a valve arrangement which includes a housing having a first conduit having a first discharge cross-section, a second conduit having a second discharge cross-section, and at least one valve seat within the interior chamber of the housing having at least one valve seat opening which cooperates with at least one valve disc. The valve disc is moveable between a closed position seated on the valve seat opening, and an open position spaced apart from the valve seat opening. There can be also provided an actuator for moving the valve disc between the open and closed positions. The valve seat opening has a cross-section that is larger than the discharge cross-section of the first conduit and/or the discharge cross-section of the second conduit. The cross-section of the valve disc is greater than the valve seat opening.
    Type: Application
    Filed: January 24, 2013
    Publication date: August 1, 2013
    Applicant: Convotherm Elektrogeraete GMBH
    Inventors: Lutz Riefenstein, Guenter Wurdinger
  • Publication number: 20100227029
    Abstract: The disclosure is a method of operating a commercial cooking equipment, in particular a hot-air steamer or fan oven, comprising the following method steps: a) selecting a product requiring cooking having an assigned cooking program or selecting at least one cooking parameter having assigned selectable products; b) loading the cooking equipment with a selected product; c) starting the associated cooking program; d) displaying the name of the program and at least the remaining cooking time; e) associating in automated manner further products or cooking programs that fit in with the cooking program of the first selected product in dependence on cooking parameters, in particular, the cooking temperature and/or the cooking humidity and/or the fan speed; f) displaying the selectable products or selectable cooking programs; g) selecting, on demand, a further product which matches the first product in accordance with the associating process; h) loading the cooking equipment with the further product; i) starting th
    Type: Application
    Filed: December 13, 2006
    Publication date: September 9, 2010
    Inventors: Markus Ernst, Lutz Riefenstein
  • Patent number: 7213592
    Abstract: A suspension frame for supporting trays includes support rails formed by legs which have cutouts and vertical sections having apertures in order to make it possible to wet the suspension frame with cleaning liquid as far as possible on all sides.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: May 8, 2007
    Assignees: Convotherm Elektrogerate GmbH, Angelo Po Grandi Cucine S.p.A.
    Inventors: Herbert Fischhaber, Lutz Riefenstein, Dario Manicardi, Giovanni Allesina
  • Patent number: 7017571
    Abstract: A heat exchanger device for a cooking appliance includes a burner arranged in a combustion chamber. The burner is connected by a feeding pipe to a mixing device which prepares a gas/air mixture necessary for the combustion and feeds it to the burner. The mixing device is connected to the burner in a gastight manner additional air is prevented from flowing in. The combustion chamber is formed by an enlargement of a heat exchanger pipe which, starting from the combustion chamber, spirally surrounds the fan wheel which provides forced circulation of the treatment medium. The heat exchanger pipe is also wound around the combustion chamber.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: March 28, 2006
    Assignee: Convotherm Elektrogeräte GmbH
    Inventors: Stan Smits, Gerd Gumienny, Lutz Riefenstein
  • Patent number: 6995341
    Abstract: The apparatus for the treatment of substances, in particular foods, has a condensation device which is constructed within the cooking chamber (2) and comprises an injector nozzle (16) and a condensation chamber (23) which is constructed as a recess (12) in the cooking chamber bottom. The injector nozzle (16) is further situated within the pressure region (13) of a circulation fan (5). The recess (12) which acts as condensation chamber leaves from the pressure region (13) of the circulation fan (4) and extends into the cooking chamber (2).
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: February 7, 2006
    Assignee: Convotherm Elecktrogeraete GmbH
    Inventors: Lutz Riefenstein, Guenther Wurdinger, Rainer Lammerskitten
  • Patent number: 6986817
    Abstract: A method of automatic cleaning of cooking cavities of cooking equipment for food processing includes the introduction of steam at a temperature of at least 100.deg. C. from a supply line and nozzle into a cooking cavity for a time period depending on the degree of disinfection desired. The cooking cavity is rinsed with the steam condensate; and the supply line and nozzle are flushed with demineralized water.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: January 17, 2006
    Assignee: Convotherm Elektogerate GmbH
    Inventors: Lutz Riefenstein, Dario Manicardi
  • Publication number: 20040255925
    Abstract: A heat exchanger device for a cooking appliance includes a burner arranged in a combustion chamber. The burner is connected by a feeding pipe to a mixing device which prepares a gas/air mixture necessary for the combustion and feeds it to the burner. The mixing device is connected to the burner in a gastight manner additional air is prevented from flowing in. The combustion chamber is formed by an enlargement of a heat exchanger pipe which, starting from the combustion chamber, spirally surrounds the fan wheel which provides forced circulation of the treatment medium. The heat exchanger pipe is also wound around the combustion chamber.
    Type: Application
    Filed: June 18, 2003
    Publication date: December 23, 2004
    Applicant: Convotherm Elektrogerate GmbH
    Inventors: Stan Smits, Gerd Gumienny, Lutz Riefenstein
  • Publication number: 20040256374
    Abstract: The apparatus for the treatment of substances, in particular foods, has a condensation device which is constructed within the cooking chamber (2) and comprises an injector nozzle (16) and a condensation chamber (23) which is constructed as a recess (12) in the cooking chamber bottom. The injector nozzle (16) is further situated within the pressure region (13) of a circulation fan (5). The recess (12) which acts as condensation chamber leaves from the pressur e region (13) of the circulation fan (4) and extends into the cooking chamber (2).
    Type: Application
    Filed: June 4, 2004
    Publication date: December 23, 2004
    Inventors: Lutz Riefenstein, Guenther Wurdinger, Rainer Lammerskitten