Patents by Inventor David W. Howard

David W. Howard 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: 9539585
    Abstract: A dynamic baffle system for a magnetic separator includes a containment barrier secured to a frame and positioned between a rotary screen drum and a magnetic drum. The dynamic baffle system further includes a baffle configured to block an opening of the containment barrier. The baffle is movable between an open position in which media mixture is capable of flowing from the containment barrier to the magnetic drum and a closed position in which the media mixture is prohibited from flowing from the containment barrier to the magnetic drum and configured to evenly build up on the containment barrier. The dynamic baffle system further includes a sensor and a controller coupled to the sensor and the baffle to control the amount of media mixture flowing from the rotary screen drum to the magnetic drum.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: January 10, 2017
    Assignee: WHEELABRATOR GROUP, INC.
    Inventors: Michael Dwayne Reaves, David W. Howard
  • Publication number: 20160288293
    Abstract: A dynamic baffle system for a magnetic separator includes a containment barrier secured to a frame and positioned between a rotary screen drum and a magnetic drum. The dynamic baffle system further includes a baffle configured to block an opening of the containment barrier. The baffle is movable between an open position in which media mixture is capable of flowing from the containment barrier to the magnetic drum and a closed position in which the media mixture is prohibited from flowing from the containment barrier to the magnetic drum and configured to evenly build up on the containment barrier. The dynamic baffle system further includes a sensor and a controller coupled to the sensor and the baffle to control the amount of media mixture flowing from the rotary screen drum to the magnetic drum.
    Type: Application
    Filed: June 14, 2016
    Publication date: October 6, 2016
    Inventors: Michael Dwayne Reaves, David W. Howard
  • Patent number: 9370781
    Abstract: A dynamic baffle system for a magnetic separator includes a containment barrier secured to a frame and positioned between a rotary screen drum and a magnetic drum. The dynamic baffle system further includes a baffle configured to block an opening of the containment barrier. The baffle is movable between an open position in which media mixture is capable of flowing from the containment barrier to the magnetic drum and a closed position in which the media mixture is prohibited from flowing from the containment barrier to the magnetic drum and configured to evenly build up on the containment barrier. The dynamic baffle system further includes a sensor and a controller coupled to the sensor and the baffle to control the amount of media mixture flowing from the rotary screen drum to the magnetic drum.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: June 21, 2016
    Assignee: WHEELABRATOR GROUP, INC.
    Inventors: Michael D. Reaves, David W. Howard
  • Publication number: 20160136656
    Abstract: A dynamic baffle system for a magnetic separator includes a containment barrier secured to a frame and positioned between a rotary screen drum and a magnetic drum. The dynamic baffle system further includes a baffle configured to block an opening of the containment barrier. The baffle is movable between an open position in which media mixture is capable of flowing from the containment barrier to the magnetic drum and a closed position in which the media mixture is prohibited from flowing from the containment barrier to the magnetic drum and configured to evenly build up on the containment barrier. The dynamic baffle system further includes a sensor and a controller coupled to the sensor and the baffle to control the amount of media mixture flowing from the rotary screen drum to the magnetic drum.
    Type: Application
    Filed: January 26, 2016
    Publication date: May 19, 2016
    Applicant: WHEELABRATOR GROUP, INC.
    Inventors: Michael D. Reaves, David W. Howard
  • Patent number: 9242251
    Abstract: A dynamic baffle system for a magnetic separator includes a containment barrier secured to a frame and positioned between a rotary screen drum and a magnetic drum. The dynamic baffle system further includes a baffle configured to block an opening of the containment barrier. The baffle is movable between an open position in which media mixture is capable of flowing from the containment barrier to the magnetic drum and a closed position in which the media mixture is prohibited from flowing from the containment barrier to the magnetic drum and configured to evenly build up on the containment barrier. The dynamic baffle system further includes a sensor and a controller coupled to the sensor and the baffle to control the amount of media mixture flowing from the rotary screen drum to the magnetic drum.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: January 26, 2016
    Assignee: WHEELABRATOR GROUP, INC.
    Inventors: Michael D. Reaves, David W. Howard
  • Publication number: 20140209516
    Abstract: A dynamic baffle system for a magnetic separator includes a containment barrier secured to a frame and positioned between a rotary screen drum and a magnetic drum. The dynamic baffle system further includes a baffle configured to block an opening of the containment barrier. The baffle is movable between an open position in which media mixture is capable of flowing from the containment barrier to the magnetic drum and a closed position in which the media mixture is prohibited from flowing from the containment barrier to the magnetic drum and configured to evenly build up on the containment barrier. The dynamic baffle system further includes a sensor and a controller coupled to the sensor and the baffle to control the amount of media mixture flowing from the rotary screen drum to the magnetic drum.
    Type: Application
    Filed: January 30, 2013
    Publication date: July 31, 2014
    Inventors: Michael D. Reaves, David W. Howard
  • Patent number: 8648654
    Abstract: An integrated circuit has a first and second voltage supply rails with first and second voltage levels and a gated voltage supply rail. Each of the circuit elements is connected either between the first and second voltage supply rails or between the gated rail and the second voltage rail. A source circuit structure comprising one or more circuit elements provides an input signal maintained at a static value during a power gated mode of operation. At least one recipient circuit structure requires receipt of the input signal at the static value during the power gated mode of operation. A distribution network comprises a first subset of circuit elements which pull their output to the first voltage level then the input signal has the static value, and a second subset of circuit elements which pull their output to the second voltage level when the input signal has the static value.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: February 11, 2014
    Assignee: ARM Limited
    Inventors: James E Myers, John P Biggs, David W Flynn, David W Howard
  • Patent number: 6904941
    Abstract: A variable diameter cylinder made from a sheet having first and second edges that are opposite to each other and that slideably connect with each other to form a helical joint of a cylinder such that sliding the edges of the sheet along the joint varies a diameter and length of the cylinder. When marked with a scale, the cylinder acts as a measuring device that is both highly accurate and easy to use. A helical-based scale can be used alone, or a linear scale can be used in combination with a Vernier scale.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: June 14, 2005
    Inventor: David W. Howard
  • Publication number: 20040050248
    Abstract: A variable diameter cylinder made from a sheet having first and second edges that are opposite to each other and that slideably connect with each other to form a helical joint of a cylinder such that sliding the edges of the sheet along the joint varies a diameter and length of the cylinder. When marked with a scale, the cylinder acts as a measuring device that is both highly accurate and easy to use. A helical-based scale can be used alone, or a linear scale can be used in combination with a Vernier scale.
    Type: Application
    Filed: September 18, 2002
    Publication date: March 18, 2004
    Inventor: David W. Howard
  • Patent number: 5459691
    Abstract: A memory circuit, in which test data are compared with stored data, comprises a plurality of memory cells each having two complementary data outputs indicative of a respective stored bit of the stored data. The two complementary outputs are selectively interchanged, in response to a respective test bit of the test data. An output signal is then generated (e.g. by a sense amplifier) in response to the relative polarities of the two complementary data outputs. The output signal is indicative of whether the stored bit is equal to the test bit. Where a multi-bit word is stored in a plurality of the memory cells, the output signals generated by a comparison of each stored bit of the multi-bit word and respective bits of the test data are combined by, for example, an AND gate. The output of the AND gate indicates whether the test data matches the stored multi-bit word.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: October 17, 1995
    Assignee: Advanced RISC Machines Limited
    Inventor: David W. Howard
  • Patent number: 5434823
    Abstract: An output signal driver is described in which a functional block 10, such as a random access memory, provides a data signal to one input of a multiplexer 26 and then via a buffer stage 24 to an output signal line 6. The other input of the multiplexer 26 receives a recirculated value from the output signal line 6. In operation, the buffer stage 24 is enabled as soon as the functional block 10 is enabled. A data valid signal dv indicating when the data signal from the functional block is ready for output is used to switch the multiplexer 26 from selecting the recirculated value to selecting the new data signal value. The output signal on the output signal line 6 is made to always have a defined state derived from the existing output signal level or, when it becomes available, the new data signal. Power wastage through the driving of spurious signals on the output signal line 6 is thus avoided.
    Type: Grant
    Filed: August 23, 1994
    Date of Patent: July 18, 1995
    Assignee: Advanced Risc Machines Limited
    Inventor: David W. Howard
  • Patent number: 4010095
    Abstract: A method for hydrodynamic separation of enantiomorphic crystals such as mono-clinic or tri-clinic crystals as well as other bodies, at least one of which does not possess a center of hydrodynamic resistance, wherein said bodies are caused to move in one direction through a fluid in face contact with a supporting surface whereby lateral separation between crystals or bodies are effected in response to a resultant perpendicular force acting on said crystals or bodies.
    Type: Grant
    Filed: August 1, 1974
    Date of Patent: March 1, 1977
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Joseph O. Hirschfelder, Edwin N. Lightfoot, David W. Howard