Patents by Inventor Theodore A. Johnson

Theodore A. Johnson 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: 6219800
    Abstract: The present invention is a storage system, and method of operation thereof, which provides improved performance over standard RAID-5 without increasing vulnerability to single-disk drive failures. The storage system comprises a processor and a plurality of data storage devices, coupled to the processor, operable to store a plurality of data stripes, each data stripe comprising a plurality of data blocks and a parity block, each data storage device operable to store one data block or the parity block of each data stripe. The storage system stores a dirty stripe bit vector of a data stripe. When an update to a data block in the data stripe is received, an image of the data block as it was when the dirty stripe bit vector was generated is stored. The data block is updated and an image of the updated data block is stored.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: April 17, 2001
    Assignee: AT&T Corp.
    Inventors: Theodore Johnson, Dennis Shasha
  • Patent number: 6216125
    Abstract: A coarse database index, and system and method of use therefor, that will quickly indicate which data partitions of a table contain a given key. Once the target data partitions are located, the exact record locations can be found using traditional indexes. The coarse indexes take little space, can be updated quickly, and searched quickly. The coarse index is in conjunction with a database including a plurality of data partitions. Each data partition includes data, including a plurality of key values of at least one key, and at least one dense index referencing the data. The coarse index indexing the plurality of key values according to data partitions containing each key value. The coarse index includes a first bitmap, which is preferably arranged in key value major format. The coarse index may also include a second bitmap, which is preferably arranged in data partition major format. The second bitmap may be transformed from data partition major format to key value major format.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: April 10, 2001
    Assignee: AT&T Corp.
    Inventor: Theodore Johnson
  • Patent number: 6141655
    Abstract: The paradigmatic view of data in typical decision support applications divides the attributes (or fields) in the data records into two groups: dimensional attributes and value attributes. The dimensional attributes classify the record, while the value attributes indicate a measured quantity. The dimensional attributes can be partitioned into a set of dimensions, which are orthogonal descriptions of the record. The attributes within a dimension form hierarchies of descriptions of the record, ranging from a coarse to a description. For example, the database might consist of records of retail sales collected from individual stores and brought together into a central data warehouse. This database might have three dimensions: store location, product, and time of sale. The value attribute might be the dollar value of the sale. A dimension might contain several attributes. For example, the store location dimension might consist of country, region, state, county, and zip code.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: October 31, 2000
    Assignee: AT&T Corp
    Inventors: Theodore Johnson, Dennis Shasha
  • Patent number: 6055491
    Abstract: An analyzer system that analyzes a plurality of co-evolving time sequences to, for example, perform correlation or outlier detection on the time sequences. The plurality of co-evolving time sequences comprise a delayed time sequence and one or more known time sequences. A goal is to predict the delayed value given the available information. The plurality of time sequences have a present value and (N-1) past values, where N is the number of samples (time-ticks) of each time sequence. The analyzer system receives the plurality of co-evolving time sequences and determines a window size ("w"). The analyzer then assigns the delayed time sequence as a dependent variable and the present value of a subset of the known time sequences, and the past values of the subset of known time sequences and the delayed time sequence, as a plurality of independent variables. Past values delayed by up to "w" steps are considered.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: April 25, 2000
    Assignees: AT&T Corp., University of Maryland
    Inventors: Alexandros Biliris, Christos N. Faloutsos, Hosagrahar Visvesvaraya Jagadish, Theodore Johnson, Nikolaos Dimitrios Sidriopoulos, Byoung-Kee Yi
  • Patent number: 6022343
    Abstract: A catheter includes a segment having a longitudinal axis. The segment has a helical coil extending coaxially with the longitudinal axis. The coil has a plurality of turns along a length of the axis. Adjacent turns have opposing surfaces joined by bridging members tying at least selected ones of the adjacent turns.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: February 8, 2000
    Assignee: Intratherapeutics, Inc.
    Inventors: Theodore A. Johnson, Paul J. Thompson
  • Patent number: 5989216
    Abstract: The present invention provides a portal for subcutaneous implantation, where the portal includes a housing having a first end, a second end, an inner wall, and a lumen between the first and second open ends. In one preferred embodiment, the first open end of the housing is sealed by a elastomeric septum, which has been injection molding into place. The elastomeric septum is bonded to the inner wall of the housing adjacent the first open end. The second open end is sealed to define a reservoir accessible through the septum.
    Type: Grant
    Filed: June 25, 1996
    Date of Patent: November 23, 1999
    Assignee: SIMS Deltec, Inc.
    Inventors: Theodore A. Johnson, Harry A. Puryear
  • Patent number: 5944023
    Abstract: A passive system for accurately determining the location of a device positioned or implanted within a patient's body is disclosed. The system includes a detectable mechanism mounted at the tip of the device which is configured to generate a self-induced magnetic field, and a detector for detecting the magnetic field of the magnet. The detector is detached from the magnet. In a preferred form, the detectable mechanism is a direct current permanent magnet. Methods of using such a system to accurately determine the location of a device within a patient's body are also disclosed.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: August 31, 1999
    Assignee: SIMS Deltec, Inc.
    Inventors: Theodore A. Johnson, Harry A. Puryear
  • Patent number: 5941858
    Abstract: A catheter apparatus for use in determining the location of a tip of a catheter inside biological tissue is disclosed. The apparatus includes a catheter, a detector positioned within the catheter, and a polyimide sheath containing the detector and forming a detector assembly. The sheath is comprised of a first member, a polyimide layer, and a second member having an undulating outer surface sandwiched therebetween. The detector assembly may be removed from the catheter without damage thereto once the tip of the catheter is in its desired location inside biological tissue.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: August 24, 1999
    Assignee: Sims Deltec, Inc.
    Inventor: Theodore A. Johnson
  • Patent number: 5743873
    Abstract: A portal assembly includes a port with at least one resealable septum, and a tube extending from the port with the tube being sized to be received inside a catheter, an angled surface surrounding the tube wherein the angled surface diverges away from the tube in a direction away from the port, and sleeve structure for forcing the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tube and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter. In a dual port construction, the outlet tube are parallel to one another at their distal ends, and the sleeve structure forces the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tubes and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter and to prevent cross-talk between lumens of a dual lumen catheter.
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: April 28, 1998
    Assignee: SIMS Deltec, Inc.
    Inventors: Qingsheng Cai, William L. Beling, Jerald Glantz, Theodore A. Johnson
  • Patent number: 5669383
    Abstract: A catheter apparatus for use in determining the location of a tip of a catheter inside biological tissue is disclosed. The apparatus includes a catheter, a detector positioned within the catheter, and a polyimide sheath containing the detector and forming a detector assembly. The sheath is comprised of a first member, a polyimide layer, and a second member having an undulating outer surface sandwiched therebetween. The detector assembly may be removed from the catheter without damage thereto once the tip of the catheter is in its desired location inside biological tissue.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: September 23, 1997
    Assignee: SIMS Deltec, Inc.
    Inventor: Theodore A. Johnson
  • Patent number: 5632729
    Abstract: A portal assembly includes a port with at least one resealable septum, and a tube extending from the port with the tube being sized to be received inside a catheter, an angled surface surrounding the tube wherein the angled surface diverges away from the tube in a direction away from the port, and sleeve structure for forcing the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tube and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter. In a dual port construction, the outlet tube are parallel to one another at their distal ends, and the sleeve structure forces the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tubes and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter and to prevent cross-talk between lumens of a dual lumen catheter.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: May 27, 1997
    Assignee: SIMS Deltec, Inc.
    Inventors: Qingsheng Cai, William L. Beling, Jerald Glantz, Theodore A. Johnson
  • Patent number: 5613945
    Abstract: A portal assembly includes a port with at least one resealable septum, and a tube extending from the port with the tube being sized to be received inside a catheter, an angled surface surrounding the tube wherein the angled surface diverges away from the tube in a direction away from the port, and sleeve structure for forcing the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tube and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter. In a dual port construction, the outlet tube are parallel to one another at their distal ends, and the sleeve structure forces the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tubes and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter and to prevent cross-talk between lumens of a dual lumen catheter.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 25, 1997
    Assignee: SIMS Deltec, Inc.
    Inventors: Qingsheng Cai, William L. Beling, Jerald Glantz, Theodore A. Johnson
  • Patent number: 5562618
    Abstract: A portal assembly includes a port with at least one resealable septum, and a tube extending from the port with the tube being sized to be received inside a catheter, an angled surface surrounding the tube wherein the angled surface diverges away from the tube in a direction away from the port, and sleeve structure for forcing the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tube and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter. In a dual port construction, the outlet tube are parallel to one another at their distal ends, and the sleeve structure forces the end of the catheter into the angled surface, thereby forcing the end of the catheter radially inwardly toward the tubes and forming a thickened portion adjacent the end of the catheter to seal and hold the catheter and to prevent cross-talk between lumens of a dual lumen catheter.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: October 8, 1996
    Assignee: SIMS Deltec, Inc.
    Inventors: Qingsheng Cai, William L. Beling, Jerald Glantz, Theodore A. Johnson
  • Patent number: 5558641
    Abstract: The present invention provides an subcutaneously implantable access device including a metallic reservoir and a two piece plastic jacket. The metallic reservoir includes a sealed septum, and a chamber. The chamber is accessible through the septum. A two piece plastic jacket surrounds the metallic reservoir. The two piece jacket includes a cowl and a base connected to one another around the reservoir. A dual port construction is also provided.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: September 24, 1996
    Assignee: Sims Deltec, Inc.
    Inventors: Jerald Glantz, Mark D. Anderson, Theodore A. Johnson, William L. Beling, Cai Qingsheng
  • Patent number: 5386828
    Abstract: The invention is directed to a guide wire apparatus and a method for detecting the location of a guide wire within the body of a patient. The apparatus includes a guide wire with an internally-housed sensing member. The guide wire assembly is structured to provide the response, maneuverability and tactile feel comparable to conventional guide wire devices. The apparatus is useful in medical treatments and diagnoses such as angioplasty or catheterization procedures, for detecting obstructions within a blood vessel of a patient, and the like.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: February 7, 1995
    Assignee: SIMS Deltec, Inc.
    Inventors: Robert C. Owens, Theodore A. Johnson
  • Patent number: 5387192
    Abstract: The present invention provides an subcutaneously implantable access device including a metallic reservoir and a two piece plastic jacket. The metallic reservoir includes a sealed septum, and a chamber. The chamber is accessible through the septum. A two piece plastic jacket surrounds the metallic reservoir. The two piece jacket includes a cowl and a base connected to one another around the reservoir. A dual port construction is also provided.
    Type: Grant
    Filed: January 24, 1994
    Date of Patent: February 7, 1995
    Assignee: SIMS Deltec, Inc.
    Inventors: Jerald Glantz, Mark D. Anderson, Theodore A. Johnson, William L. Beling, Cai Qingsheng
  • Patent number: 4406360
    Abstract: An accumulating conveyer is provided in which rollers are utilized which have a drive mechanism with a driven load-engaging portion in permanent frictional engagement with a driving portion. The drive mechanism includes an adjustable bias means so that the driving force between a driving portion and a driven portion is adjustable according to the characteristics of the loads to be conveyed. A friction pad is positioned between a disc in the driving portion and a disc in the driven portion of the drive mechanism; the two discs are urged against the friction pad by a compression spring. When the weight of a load in contact with the driven portion is below a predetermined value, the friction between the friction pad and the two discs is sufficient to cause the two discs and the friction pad to rotate conjointly thereby coupling the driving portion to the driven portion.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: September 27, 1983
    Assignee: Conveyersmith, Inc.
    Inventors: Jason T. Smith, Thomas A. Church, Theodore Johnson
  • Patent number: 4009617
    Abstract: Sampling apparatus for periodically withdrawing small samples of liquid flowing through a pipe. The apparatus embodies an intake passage communicating with a T-section in the pipe. Liquid in the intake passage is pumped by a diaphragm which is pulsed pneumatically at periodic intervals. A check valve in the intake passage has one end projecting into the diaphragm chamber and is pushed positively by the diaphragm to intake port-closing position. A second passage communicating with the intake passage has a pop valve which opens under the diaphragm-created pressure after the check valve closes. Each periodic sample is collected from the latter passage in a plastic bag or other container. The apparatus can be washed and sanitized while on line by hose and coupling unit placed on the apparatus.
    Type: Grant
    Filed: March 18, 1976
    Date of Patent: March 1, 1977
    Inventor: Julius Theodore Johnson
  • Patent number: 3965750
    Abstract: Sampling device adapted for sampling of liquids with strata of varying composition embodying an elongated tube with a well cap loosely mounted on one end thereof, an elastomer cap with an air vent hole mounted on the other end thereof, and a second elongated tube adapted to contain sterilizing liquid and in which the sampling device is placed when not in use.
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: June 29, 1976
    Inventor: Julius Theodore Johnson
  • Patent number: D373488
    Type: Grant
    Filed: June 16, 1995
    Date of Patent: September 10, 1996
    Inventor: Theodore A. Johnson