Patents by Inventor David R. Fletcher

David R. Fletcher 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: 11952101
    Abstract: An assembly integrates an aft wing spar root fitting to an aircraft fuselage when joining the aircraft wing to the aircraft body. The assembly provides structural strength to the connection between the aircraft wing and the aircraft body, provides corrosion prevention and provides improved inspection capabilities and repair capabilities to the aircraft wing and aircraft body connection.
    Type: Grant
    Filed: March 3, 2022
    Date of Patent: April 9, 2024
    Assignee: The Boeing Company
    Inventors: Michael R. Rush, Orion P. Watson, Daniel H. Fletcher, Ryan A. Fear, Brent E. Beneke, David H. Leibov, Patricia W. Estell, Norma L Alvarez-Quinones, Soo H. Teoh, Jesse R. Wiseman, Mark E. Shadell, Mark R. Mclaughlin, Emmett A. Salisbury
  • Publication number: 20170179885
    Abstract: Off-chip distributed drain biasing increases output power and efficiency for high power distributed amplifier MMICs. An off-chip bias circuit has a common input for receiving DC bias current and a plurality of parallel-connected bias chokes among which the DC bias current is divided. The chokes are connected to a like plurality of drain terminals at different FET amplifier stages to supply DC bias current at different locations along the output transmission line. Off-chip distributed drain biasing increases the level of DC bias current that can be made available to the amplifier and add inductances to selected FET amplifier stages, typically the earlier stages, to modify the load impedance seen at the drain terminal to better match the amplifier stages to improve power and efficiency.
    Type: Application
    Filed: December 21, 2015
    Publication date: June 22, 2017
    Inventors: David R. Fletcher, David D. Heston
  • Patent number: 9673759
    Abstract: Off-chip distributed drain biasing increases output power and efficiency for high power distributed amplifier MMICs. An off-chip bias circuit has a common input for receiving DC bias current and a plurality of parallel-connected bias chokes among which the DC bias current is divided. The chokes are connected to a like plurality of drain terminals at different FET amplifier stages to supply DC bias current at different locations along the output transmission line. Off-chip distributed drain biasing increases the level of DC bias current that can be made available to the amplifier and add inductances to selected FET amplifier stages, typically the earlier stages, to modify the load impedance seen at the drain terminal to better match the amplifier stages to improve power and efficiency.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: June 6, 2017
    Assignee: Raytheon Company
    Inventors: David R. Fletcher, David D. Heston
  • Patent number: 7200965
    Abstract: A securing mechanism for use in a holster, gun safe, base station, recharging/docking station, gun rack, or other safety housing for a firearm or other item, including one or more retaining members that engage the trigger guard, barrel, or other part of the firearm to prevent withdrawal of the firearm from the safety housing by anyone other than an authorized user of the firearm. The securing mechanism includes a biometric identification mechanism such as a fingerprint sensor for scanning fingerprint information of a prospective user of the firearm, and a processor for comparing the scanned biometric information with stored biometric information of an authorized user and releasing the retaining member only if the scanned biometric information matches that of the authorized user.
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: April 10, 2007
    Inventors: Albert W. Vor Keller, David R. Fletcher, Robert C. Chinn
  • Patent number: 7095285
    Abstract: According to one embodiment of the present invention a method for biasing a power amplifier having at least one transistor exhibiting kink anomaly includes providing a bias circuit coupled to a gate of at least one transistor of the power amplifier. The method also includes providing, by the bias circuit, a bias voltage to the gate. The bias circuit has a load characteristic that intersects a current versus gate voltage curve for the gate at a frequency of operation of the power amplifier only once and that exhibits a low impedance at the intersection of the load characteristic with the current versus gate curve of the gate.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: August 22, 2006
    Assignee: Raytheon Company
    Inventors: David D. Heston, John G. Heston, Brian P. Helm, Gordon R. Scott, Scott Mitchel Heston, David R. Fletcher, William S. Kopp
  • Patent number: 6918519
    Abstract: A securing mechanism for use in a holster, gun safe, base station, recharging/docking station, gun rack, or other safety housing for a firearm or other item, including one or more retaining members that engage the trigger guard, barrel, or other part of the firearm to prevent withdrawl of the firearm from the safety housing by anyone other than an authorized user of the firearm. The securing mechanism includes a biometric identification mechanism such as a fingerprint sensor for scanning fingerprint information of a prospective user of the firearm, and a processor for comparing the scanned biometric information with stored biometric information of an authorized user and releasing the retaining member only if the scanned biometric information matches that of the authorized user.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: July 19, 2005
    Assignee: Safety First Devices, Incorporated
    Inventors: Albert W. Vor Keller, David R. Fletcher, Robert C. Chinn
  • Patent number: 6588635
    Abstract: A safety holster for a firearm, including a pivotally mounted retaining member for engaging the trigger guard of the firearm and preventing withdrawal of the firearm from the holster by anyone other than an authorized user of the firearm. The holster includes a fingerprint sensor for scanning fingerprint information of a perspective user of the firearm, and a processor for comparing the scanned fingerprint information with stored fingerprint information of an authorized user and releasing the retaining member only if the scanned fingerprint information matches that of the authorized user.
    Type: Grant
    Filed: April 4, 2001
    Date of Patent: July 8, 2003
    Assignee: Safety First Devices, Inc.
    Inventors: Albert W. Vor Keller, David R. Fletcher
  • Patent number: 6533149
    Abstract: A safety holster for a firearm, including two pivotally mounted retaining members that cooperate to engage the trigger guard of the firearm and prevent withdrawal of the firearm from the holster by anyone other than an authorized user of the firearm. The holster includes a fingerprint sensor for scanning fingerprint information of a perspective user of the firearm, and a processor for comparing the scanned fingerprint information with stored fingerprint information of an authorized user and releasing the retaining member only if the scanned fingerprint information matches that of the authorized user.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: March 18, 2003
    Inventors: Al Vor Keller, David R. Fletcher, Robert C. Chinn
  • Publication number: 20020158095
    Abstract: A securing mechanism for use in a holster, gun safe, base station, recharging/docking station, gun rack, or other safety housing for a firearm or other item, including one or more retaining members that engage the trigger guard, barrel, or other part of the firearm to prevent withdrawal of the firearm from the safety housing by anyone other than an authorized user of the firearm. The securing mechanism includes a biometric identification mechanism such as a fingerprint sensor for scanning fingerprint information of a prospective user of the firearm, and a processor for comparing the scanned biometric information with stored biometric information of an authorized user and releasing the retaining member only if the scanned biometric information matches that of the authorized user.
    Type: Application
    Filed: April 4, 2002
    Publication date: October 31, 2002
    Inventors: Albert W. Vor Keller, David R. Fletcher, Robert C. Chinn
  • Publication number: 20010048009
    Abstract: A safety holster for a firearm, including two pivotally mounted retaining members that cooperate to engage the trigger guard of the firearm and prevent withdrawal of the firearm from the holster by anyone other than an authorized user of the firearm. The holster includes a fingerprint sensor for scanning fingerprint information of a perspective user of the firearm, and a processor for comparing the scanned fingerprint information with stored fingerprint information of an authorized user and releasing the retaining member only if the scanned fingerprint information matches that of the authorized user.
    Type: Application
    Filed: July 11, 2001
    Publication date: December 6, 2001
    Inventors: Al Vor Keller, David R. Fletcher, Robert C. Chinn
  • Publication number: 20010019071
    Abstract: A safety holster for a firearm, including a pivotally mounted retaining member for engaging the trigger guard of the firearm and preventing withdrawal of the firearm from the holster by anyone other than an authorized user of the firearm. The holster includes a fingerprint sensor for scanning fingerprint information of a perspective user of the firearm, and a processor for comparing the scanned fingerprint information with stored fingerprint information of an authorized user and releasing the retaining member only if the scanned fingerprint information matches that of the authorized user.
    Type: Application
    Filed: April 4, 2001
    Publication date: September 6, 2001
    Inventors: Albert W. Vor Keller, David R. Fletcher
  • Patent number: 6230946
    Abstract: A safety holster for a firearm, including a pivotally mounted retaining member for engaging the trigger guard of the firearm and preventing withdrawal of the firearm from the holster by anyone other than an authorized user of the firearm. The holster includes a fingerprint sensor for scanning fingerprint information of a perspective user of the firearm, and a processor for comparing the scanned fingerprint information with stored fingerprint information of an authorized user and releasing the retaining member only if the scanned fingerprint information matches that of the authorized user.
    Type: Grant
    Filed: February 23, 2000
    Date of Patent: May 15, 2001
    Inventors: Albert W. Vor Keller, David R. Fletcher