Patents by Inventor David L. Brown

David L. Brown 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).

  • Data processor with flexible data encryption
    Patent number: 5892826
    Abstract: A data processor (20) which flexibly encrypts data within different address ranges includes an encryption determination circuit (50) to monitor an address conducted on an internal address bus (22) and when the address is within certain predefined ranges, perform encryption or decryption of address and/or data. For example the encryption determination circuit (50) may be used to selectively enable a data encryption-decryption circuit (60). When the data encryption-decryption circuit (60) is disabled, data conducted on an internal data bus (23) becomes "cleartext", i.e., non-encrypted. In one embodiment, the data encryption-decryption is performed in partial dependence on the address itself, and the address conducted to the external address bus is itself selectively encrypted as well.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: April 6, 1999
    Assignee: Motorola, Inc.
    Inventors: David L. Brown, Raul A. Pombo, Paul J. Polansky
  • Heterocyclecarbonyl amino acid hydroxyethylamino sulfonamide retroviral protease inhibitors
    Patent number: 5776971
    Abstract: Selected heterocyclecarbonyl amino acid hydroxyethylamino sulfonamide compounds are effective as retroviral protease inhibitors, and in particular as inhibitors of HIV protease. The present invention relates to such retroviral protease inhibitors and, more particularly, relates to selected novel compounds, composition and method for inhibiting retroviral proteases, such as human immunodeficiency virus (HIV) protease, prophylactically preventing retroviral infection or the spread of a retrovirus, and treatment of a retroviral infection.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 7, 1998
    Assignee: G.D. Searle & Co.
    Inventors: Daniel P. Getman, Gary A. DeCrescenzo, John N. Freskos, Michael L. Vazquez, James A. Sikorski, Balekudru Devadas, Srinivasan Nagarajan, David L. Brown, Joseph J. McDonald
  • Amino acid hydroxyethylamino sulfonamide retroviral protease inhibitors
    Patent number: 5756533
    Abstract: Selected amino acid hydroxyethylamino sulfonamide compounds are effective as retroviral protease inhibitors, and in particular as inhibitors of HIV protease. The present invention relates to such retroviral protease inhibitors and, more particularly, relates to selected novel compounds, composition and method for inhibiting retroviral proteases, such as human immunodeficiency virus (HIV) protease, prophylactically preventing retroviral infection or the spread of a retrovirus, and treatment of a retroviral infection.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: May 26, 1998
    Assignee: G.D. Searle & Co.
    Inventors: Daniel P. Getman, Gary A. DeCrescenzo, John N. Freskos, Michael L. Vazquez, James A. Sikorski, Balekudru Devadas, Srinivasan Nagarajan, David L. Brown, Joseph J. McDonald
  • Methodical scanning method and apparatus for portable radiotelephones
    Patent number: 5754956
    Abstract: A radiotelephone handset (120) includes an antenna (122) and receiver (124) for receiving a control channel from a plurality of base stations (102, 104, 106). A time division multiple access controller circuit (126) coupled to the receiver stores all received control channel information in a captured data buffer (134). Under control of a processor (128), the handset identifies as candidate suitable base stations those base stations having acceptable received signal strength, acceptable identity or system capability. From the candidates, the handset (120) chooses a suitable base station having acceptable signal quality, access rights and system capability and synchronizes communication with the suitable base station.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: May 19, 1998
    Assignee: Motorola, Inc.
    Inventors: Victor M. Abreu, Raul A. Pombo, Paul D. Marko, David L.. Brown
  • Suture retainer and method
    Patent number: 5746311
    Abstract: A surgical suture retainer retains the suture in an epitrochoidal, or hourglass configuration. One embodiment includes an insert member mounted to one of several foldable connected panels of the suture retainer. The insert member preferably has first and second wings which fold over to form a suture retaining pocket. The suture is held in a looped configuration having an hourglass shape. Another embodiment employs tabs cut from one of the panels to retain the suture in the hourglass shape. Yet another embodiment employs a cover sheet bonded to a base panel, wherein bonding areas are located to maintain the suture loop in an hourglass shape.
    Type: Grant
    Filed: October 18, 1996
    Date of Patent: May 5, 1998
    Assignee: United States Surgical Corporation
    Inventors: David L. Brown, Andrew P. Stellon, Edward A. Gemma, Jr.
  • Method for enhancing fluid loss control in subterranean formation
    Patent number: 5680900
    Abstract: The present invention provides a method of controlling fluid loss to a permeable formation penetrated by a wellbore. A novel fluid loss agent is prepared by forming a crosslinked polymer gel which then is sheared to break the gel into discrete particles of a particular size range. A slurry then is formed of the particles by dispersing the particles in an aqueous fluid having a density similar to that of the gel particles. The slurry then is introduced into contact with the permeable formation and a filter cake of the particles is formed upon contact with the formation and loss of the slurrying fluid to the formation. The filter cake provides further fluid loss control to the permeable formation.
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: October 28, 1997
    Assignee: Halliburton Energy Services Inc.
    Inventors: Philip D. Nguyen, David L. Brown, Jimmie D. Weaver, Wes C. Lavin, Steven F. Wilson
  • Solid ink stick for a color printer
    Patent number: D402308
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: December 8, 1998
    Assignee: Tektronix, Inc.
    Inventors: Penelope C. Yao, Henry Y. Chin, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D403351
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: December 29, 1998
    Assignee: Tektronix, Inc.
    Inventors: Penelope C. Yao, David L. Brown, Henry Y. Chin
  • Solid ink stick for a color printer
    Patent number: D403352
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: December 29, 1998
    Assignee: Tektronix, Inc.
    Inventors: David L. Brown, Henry Y. Chin, Penelope C. Yao
  • Solid ink stick for a color printer
    Patent number: D403699
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: January 5, 1999
    Assignee: Tektronix, Inc.
    Inventors: Henry Y. Chin, Fred T. Mattern, Penelope C. Yao, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D407109
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: March 23, 1999
    Assignee: Tektronix, Inc.
    Inventors: Penelope C. Yao, Henry Y. Chin, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D407110
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: March 23, 1999
    Assignee: Tektronix, Inc.
    Inventors: Penelope C. Yao, Henry Y. Chin, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D407111
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: March 23, 1999
    Assignee: Tektronix, Inc.
    Inventors: David L. Brown, Henry Y. Chin, Penelope C. Yao
  • Solid ink stick for a color printer
    Patent number: D407112
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: March 23, 1999
    Assignee: Textronix, Inc.
    Inventors: Henry Y. Chin, Penelope C. Yao, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D407742
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: April 6, 1999
    Assignee: Tektronix, Inc.
    Inventors: Penelope C. Yao, Henry Y. Chin, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D407743
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: April 6, 1999
    Assignee: Tektronix, Inc.
    Inventors: Penelope C. Yao, David L. Brown, Henry Y. Chin
  • Solid ink stick for a color printer
    Patent number: D407745
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: April 6, 1999
    Assignee: Tektronix, Inc.
    Inventors: David L. Brown, Penelope C. Yao, Henry Y. Chin
  • Solid ink stick for a color printer
    Patent number: D408849
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: April 27, 1999
    Assignee: Tektronix, Inc.
    Inventors: Henry Y. Chin, Penelope C. Yao, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D409235
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: May 4, 1999
    Assignee: Tektronix, Inc.
    Inventors: Henry Y. Chin, Penelope C. Yao, David L. Brown
  • Solid ink stick for a color printer
    Patent number: D410026
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: May 18, 1999
    Assignee: Tektronix, Inc.
    Inventors: David L. Brown, Penelope C. Yao, Henry Y. Chin