Patents by Inventor David A. Spofford

David A. Spofford 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: 9657423
    Abstract: Method and system for controlling a concentration of ozone is a washing machine to be at or below a target value so that a cumulative contact time of the ozone with laundry approaches a duration of time of an entire wash stage or cycle thereby ensuring killing of any infectious diseases. The method comprises supplying ozone to the washing machine, upon filling the washing machine, and supplementing the supplied ozonated water by supplying additional ozone to the wash machine during each wash stage or cycle, and controlling the supply of ozone supplied to the wash machine so that the concentration of ozone sampled or exhausting from the washing machine is controlled to be within a control band between 60% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 60% of the duration of the entire wash stage or cycle.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: May 23, 2017
    Assignee: AWOIS LLC
    Inventors: Ralph G. Daniels, David A. Spofford
  • Patent number: 8984914
    Abstract: A system for controlling a supply of ozone to a washing machine during operation thereof. The system comprising a washing machine having an internal drum for containing laundry and a quantity of a water. An ozone generator is connected to the washing machine and the ozone generator produces and supplies the produced ozone to the washing machine for ozonating the water. At least one sensor is provided for sensing a quantity of ozone exhausting from the washing machine during operation thereof, and the at least sensor being coupled to the ozone generator for interrupting production of ozone when a quantity of ozone exhausting from the washing machine exceeds a safe level.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: March 24, 2015
    Assignee: AWOIS LLC
    Inventors: Ralph G. Daniels, David A. Spofford
  • Publication number: 20140033445
    Abstract: Method and system for controlling a concentration of ozone is a washing machine to be at or below a target value so that a cumulative contact time of the ozone with laundry approaches a duration of time of an entire wash stage or cycle thereby ensuring killing of any infectious diseases. The method comprises supplying ozone to the washing machine, upon filling the washing machine, and supplementing the supplied ozonated water by supplying additional ozone to the wash machine during each wash stage or cycle, and controlling the supply of ozone supplied to the wash machine so that the concentration of ozone sampled or exhausting from the washing machine is controlled to be within a control band between 60% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 60% of the duration of the entire wash stage or cycle.
    Type: Application
    Filed: July 24, 2013
    Publication date: February 6, 2014
    Applicant: AWOIS LLC
    Inventors: Ralph G. DANIELS, David A. SPOFFORD
  • Publication number: 20110296629
    Abstract: A system for controlling a supply of ozone to a washing machine during operation thereof. The system comprising a washing machine having an internal drum for containing laundry and a quantity of a water. An ozone generator is connected to the washing machine and the ozone generator produces and supplies the produced ozone to the washing machine for ozonating the water. At least one sensor is provided for sensing a quantity of ozone exhausting from the washing machine during operation thereof, and the at least sensor being coupled to the ozone generator for interrupting production of ozone when a quantity of ozone exhausting from the washing machine exceeds a safe level.
    Type: Application
    Filed: August 18, 2011
    Publication date: December 8, 2011
    Applicant: DANIELS EQUIPMENT COMPANY, INC.
    Inventors: Ralph G. Daniels, David A. Spofford
  • Patent number: 8020232
    Abstract: A system for controlling a supply of ozone to a washing machine during operation thereof. The system comprising a washing machine having an internal drum for containing laundry and a quantity of a water. An ozone generator is connected to the washing machine and the ozone generator produces and supplies the produced ozone to the washing machine for ozonating the water. At least one sensor is provided for sensing a quantity of ozone exhausting from the washing machine during operation thereof, and the at least sensor being coupled to the ozone generator for interrupting production of ozone when a quantity of ozone exhausting from the washing machine exceeds a safe level.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: September 20, 2011
    Assignee: Daniels Equipment Company, Inc.
    Inventors: Ralph G. Daniels, David A. Spofford
  • Publication number: 20100107343
    Abstract: A system for controlling a supply of ozone to a washing machine during operation thereof. The system comprising a washing machine having an internal drum for containing laundry and a quantity of a water. An ozone generator is connected to the washing machine and the ozone generator produces and supplies the produced ozone to the washing machine for ozonating the water. At least one sensor is provided for sensing a quantity of ozone exhausting from the washing machine during operation thereof, and the at least sensor being coupled to the ozone generator for interrupting production of ozone when a quantity of ozone exhausting from the washing machine exceeds a safe level.
    Type: Application
    Filed: November 9, 2009
    Publication date: May 6, 2010
    Applicant: DANIELS EQUIPMENT COMPANY, INC.
    Inventors: Ralph G. Daniels, David A. Spofford
  • Patent number: 7614260
    Abstract: A system for controlling a supply of ozone to a washing machine during operation thereof. The system comprising a washing machine having an internal drum for containing laundry and a quantity of a water. An ozone generator is connected to the washing machine and the ozone generator produces and supplies the produced ozone to the washing machine for ozonating the water. At least one sensor is provided for sensing a quantity of ozone exhausting from the washing machine during operation thereof, and the at least sensor being coupled to the ozone generator for interrupting production of ozone when a quantity of ozone exhausting from the washing machine exceeds a safe level.
    Type: Grant
    Filed: October 3, 2005
    Date of Patent: November 10, 2009
    Assignee: Daniels Equipment Company, Inc.
    Inventors: Ralph G. Daniels, David A. Spofford
  • Publication number: 20060096038
    Abstract: A system for controlling a supply of ozone to a washing machine during operation thereof. The system comprising a washing machine having an internal drum for containing laundry and a quantity of a water. An ozone generator is connected to the washing machine and the ozone generator produces and supplies the produced ozone to the washing machine for ozonating the water. At least one sensor is provided for sensing a quantity of ozone exhausting from the washing machine during operation thereof, and the at least sensor being coupled to the ozone generator for interrupting production of ozone when a quantity of ozone exhausting from the washing machine exceeds a safe level.
    Type: Application
    Filed: October 3, 2005
    Publication date: May 11, 2006
    Inventors: Ralph Daniels, David Spofford
  • Patent number: 6506309
    Abstract: A system comprising an ozone generator for generating ozone and a venturi for mixing the liquid to be ozonated with the generated ozone. The ozone generator is coupled to an orifice for supplying the generated ozone thereto. A pump is coupled to an outlet of the reservoir for pumping liquid to be ozonated from the reservoir to venturi. An outlet of the venturi is connected to a return inlet of the reservoir for supplying ozonated liquid back to the reservoir. A mixing chamber interconnects the outlet of the venturi to the return inlet of the reservoir, and the mixing chamber facilitates adequate mixing of the ozone supplied to the liquid to be ozonated and facilitates substantially complete dissolving of any remaining ozone bubbles and ozone pockets within the liquid to thereby result in substantially uniform mixture of ozonated liquid for supply back to the reservoir having an increased contact rate of ozone to liquid of about 80% to 90%.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: January 14, 2003
    Assignee: Awois, LLC
    Inventors: Ralph G. Daniels, David A. Spofford