Patents Represented by Attorney, Agent or Law Firm John S. Ferrell
  • Patent number: 6381095
    Abstract: A high performance magnetic write element incorporated in a read/write head having a lower pole including high Bsat back gap and write gap pedestals. The write element further including an upper pole connected with the lower pole to form a yoke and a coil disposed within the yoke and enclosed covered with a write gap material and surrounded by insulating material. The write gap material provides separation between the first and second poles at one end of the yoke to form a write gap therebetween. A method of forming the write element of the present invention includes forming the first pole and building thereupon a back gap pedestal and a write gap pedestal at back and front ends of the first pole respectively. A dielectric layer is deposited on top of the first pole and planarized to have an upper surface coplanar with the top of the first and second pedestals. Upon the dielectric layer the coil is formed on which is deposited the write gap material.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: April 30, 2002
    Assignee: Read-Rite Corporation
    Inventors: Kyusik Sin, Ronald Barr
  • Patent number: 6354479
    Abstract: Dissipative ceramic bonding tips for wire bonding electrical connections to bonding pads on integrated circuits chips and packages are disclosed. In accordance with the principles of the present invention, to avoid damaging delicate electronic devices by any electrostatic discharge, an ultrasonic bonding wedge tool tip must conduct electricity at a rate sufficient to prevent charge buildup, but not at so high a rate as to overload the device being bonded. For best results, a resistance in the tip assembly itself should range from 105 to 1012 ohms. In addition, the wedges must also have specific mechanical properties to function satisfactorily.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: March 12, 2002
    Assignee: SJM Technologies
    Inventors: Steven Frederick Reiber, Mary Louise Reiber
  • Patent number: 6353318
    Abstract: The apparatus of the present invention is embodied in a magnetic field sensor having a magnetoresistive element, a magnetic bias layer for biasing the magnetoresistive element with a magnetic field, and an electrical insulator positioned between the magnetic bias layer and the magnetoresistive element. The insulator prevents the flow of electrical current between the magnetoresistive element and the magnetic bias layer and at least a portion of the insulator allows passage of the magnetic field from the magnetic bias layer to the magnetoresistive element such that the magnetoresistive element is biased.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: March 5, 2002
    Assignee: Read-Rite Corporation
    Inventors: Kyusik Sin, Yingjian Chen, Ningja Zhu, Bill Crue
  • Patent number: 6330137
    Abstract: A magnetoresistive device includes an insulating barrier formed of carbon. In particular, the carbon can be diamond-like carbon, and more particularly, the carbon can be tetrahedral amorphous carbon (t-aC). The insulating barrier can be disposed between the free layer and pinned layer of a spin valve read sensor or otherwise incorporated with other various read sensor configurations. The insulating barrier is configured to increase a resistance of the read sensor with which it is incorporated, and thereby to increase the read signal. Such a barrier can be formed by cathodic arc deposition techniques, with substantially defect-free thicknesses from about 5 Å and above, and band gap values in the range of about 1 eV to about 5.4 eV.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: December 11, 2001
    Assignee: Read-Rite Corporation
    Inventors: Kenneth E. Knapp, Robert E. Rottmayer, Francis Ryan
  • Patent number: 6330136
    Abstract: An Spin Dependent Tumelina SDT read sensor includes a first ferromagnetic (FM) layer and a second FM layer separated by an insulating layer. The first FM layer and second FM layer are substantially electrically isolated from each other. Specifically, the sidewalls of the SDT read sensor are substantially free of electrical paths between the first FM layer and the second FM layer. Also, a surface of the second FM layer that is substantially parallel to the air bearing surface, is recessed from the air bearing surface. A method for forming an SDT read sensor includes depositing a first FM material layer, depositing an intermediate insulation material layer over the first FM material layer, and then depositing a second FM material layer over the intermediate insulation material layer. The second FM material layer and the intermediate insulation material layer are etched, with the etching being stopped before the etching etches the first FM material layer.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: December 11, 2001
    Assignee: Read-Rite Corporation
    Inventors: Lien-Chang Wang, Chih-Huang Lai, Tai Min, Zhupei Shi, Billy W. Crue, Jr.
  • Patent number: 5600774
    Abstract: A graphical interface for visually specifying the behavior of combinations of finite-state and continuous-state actors. The state of an actor may be controlled by the states of other actors. The motion of continuous-state actors is constrained by functions represented as, and analogous to, grooves, sockets, pins, glue, springs, and boxes. These functions may be represented graphically on the actor so that the system of constraints is readily ascertainable to the user.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: February 4, 1997
    Assignee: Apple Computer, Inc.
    Inventor: James C. Spohrer
  • Patent number: 5588098
    Abstract: A method and apparatus for direct manipulation of 3-D objects on computer display. This method and apparatus provides for a 3-D bounding region wherein the 3-D bounding region has sensitive areas which the user can select with a reference pointer such that when the user manipulates the reference pointer after selecting a sensitive area the 3-D bounding region and the object within it are manipulated with direct kinesthetic correspondence between the user's manipulation of the reference pointer and the bounding region and object manipulation.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 24, 1996
    Assignee: Apple Computer, Inc.
    Inventors: Michael Chen, Stephanie L. Houde, Robert H. Seidl
  • Patent number: 5500827
    Abstract: The present invention facilitates the Dynamic Random Access Memory (DRAM) refresh function in a less obtrusive manner than in the prior art. The present invention facilitates the refresh function during idle time when the DRAM is not busy handling read or write transactions. If insufficient idle time exists then the present invention will force a refresh operation thus ensuring that all memory cells are maintained in a properly charged state.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: March 19, 1996
    Assignee: Apple Computer, Inc.
    Inventors: Farid A. Yazdy, Michael J. Dhuey
  • Patent number: 5444781
    Abstract: A method and apparatus for decryption using cache storage wherein imported ciphertext is decrypted to produce unencrypted plaintext data. As a communication sequence containing an initialization vector and a block of ciphertext is imported, the initialization vector is applied to a cache and to a decoder. The initialization vector is then compared with other initialization vectors stored in the cache to determine whether the specific initialization vector has previously been received and stored. If the specific initialization vector is found to be stored in the cache, then the PN sequence associated with that initialization vector is written to the decoder, and the stored PN sequence is used to decode the imported ciphertext.If a determination is made that the initialization vector has not been previously received, then the read cache signal instructs the multiplexer to connect the PN generator to the decoder, and the initialization vector is used to generate a new PN sequence.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: August 22, 1995
    Assignee: Apple Computer Inc.
    Inventors: Kerry E. Lynn, Jonathan M. Zweig, Richard W. Mincher
  • Patent number: 5440720
    Abstract: A method and apparatus to enable the size reduction of geometric databases used in the analysis of integrated circuit layouts. The results of design rule analysis on the groups of polygon shapes comprising the integrated circuit layout are stored as either in-group results or override results in a dedicated result register memory. In-group results are design rule analysis results which contain only shapes contained in the group being analyzed. Override results are additional shape models produced when the spatial relationship between the shapes in the group being analyzed and shapes in lower level groups invalidate the results previously obtained for those lower level groups. The data base structure is created using a general purpose computer consisting of a CPU connected to a plurality of memories along a common data bus.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: August 8, 1995
    Assignee: Cadence Design Systems, Inc.
    Inventors: Allen Baisuck, Richard L. Fairbank, Walter K. Gowen, III, Jon R. Henriksen, William W. Hoover, III, Judith A. Huckabay, Eric Rogoyski, Anton G. Salecker
  • Patent number: 5438622
    Abstract: A method and apparatus for improving the security of an electronic codebook encryption scheme comprises a transmitter unit for encoding or encrypting data and a separate authorized receiver for decoding or decrypting the data. During the encryption of the plaintext data, a randomly generated offset is introduced into the PN sequence to vary the starting point of the PN sequence as it is applied to the plaintext data. The offset is encrypted with the secret key and the unencrypted IV, encrypted offset, and ciphertext are exported by the transmitter to the receiver for decrypting.The encoded communication is imported by the receiver and the encrypted offset portion is extracted. The receiver combines the encrypted offset with the secret key to decipher the offset value. The offset and PN sequence are then combined with the ciphertext, using an XOR gate, to recover the original plain text from the ciphertext.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: August 1, 1995
    Assignee: Apple Computer, Inc.
    Inventors: James O. Normile, Ke-Chiang Chu
  • Patent number: 5426379
    Abstract: A programmable gate array comprises an array of configurable logic blocks. Each configurable logic block is controlled by one or more rows and columns of memory cells in a memory array. According to the invention, an older bitstream may be used without modification in a newer programmable gate array. A frame register includes a plurality of active memory locations called frame bits which correspond to columns of memory cells within the memory array and at least one spare frame bit which does not correspond to a column of memory cells within the memory array. A similar configuration of row pointer cells comprises a shift register for enabling row by row addressing of the memory array.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: June 20, 1995
    Assignee: Xilinx, Inc.
    Inventor: Stephen M. Trimberger
  • Patent number: 5396151
    Abstract: A circuit for reducing extremely low frequency (ELF) electric fields on cathode ray robe (CRT) devices comprises a power supply means, a CRT, a voltage sensing means, an amplification means, and a capacitive coupling within a feedback path to the CRT. A CRT anode voltage variation sensed by the voltage sensing means is amplified and inverted by the amplification means, producing a signal which is applied to the capacitive coupling within the feedback path. This signal modifies the impedance at the CRT anode, decreasing the voltage variation and thereby reducing ELF electric field magnitudes.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: March 7, 1995
    Assignee: Apple Computer, Inc.
    Inventor: Richard D. Cappels, Sr.
  • Patent number: 5390244
    Abstract: An apparatus and method for detecting the presence of ringer signals in a telephone which samples the incoming telephone signals within a prescribed time interval, windows the signals, and computes a set of auto-correlation coefficients. These coefficients are normalized, and their absolute values are calculated and summed and compared with an empirically-derived threshold. If the coefficient sum exceeds the threshold, a high degree of correlation within incoming signals is indicated, distinguishing the incoming signal as containing ringer signal constituents.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: February 14, 1995
    Assignee: Polycom, Inc.
    Inventors: Brian L. Hinman, Shan-Shan Huang, Eric K. Gaut
  • Patent number: 5365583
    Abstract: A method is disclosed for maintaining loop stability between a transmit and a receive path of a speaker phone which is capable of operating in either a full-duplex or a half-duplex mode. Loop stability is maintained and normal operation is achieved by controlling transmit and receive path attenuators. The method first determines whether feedforward or feedback signal levels should be used. Based on this determination, the signal and noise parameters along various points in the transmit and receive path are evaluated. Based on the parameter values, the transmit and receive attenuators are adjusted to maintain loop stability and to operate the speaker phone in the proper state. Additionally, when the speaker phone adjusts the transmit attenuator for greater signal attenuation in order to maintain loop stability the noise fill-in component of the speaker phone will generate additional background noise to maintain a constant background noise level, as perceived by the far-end user.
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: November 15, 1994
    Assignee: Polycom, Inc.
    Inventors: Shan-Shan Huang, Brian L. Hinman, Eric K. Gaut
  • Patent number: 5345508
    Abstract: A digital encryption structure allows the varying of the computational overhead by selectively reusing, according to the desired level of security, a pseudorandom encoding sequence at the transmitter end and by storing and reusing pseudorandom decoding sequences, associated with one or more transmitters at the receiver end. A public initialization vector is combined with a secret key to produce a deterministic sequence from a pseudorandom number generator. This pseudorandom sequence in turn, is used to convert plaintext to ciphertext. The sequence may be selectively reused by storing the sequence to a transmitter memory cache and iteratively reading the sequence from memory according to a counter which controls the level of security of the encryption system. The ciphertext is decrypted on the receiver end by invertibly combining the ciphertext with the same pseudorandom sequence used by the transmitter to originally encode the plaintext.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: September 6, 1994
    Assignee: Apple Computer, Inc.
    Inventors: Kerry E. Lynn, Jonathan M. Zweig, Richard W. Mincher
  • Patent number: 5320405
    Abstract: A sunshade comprising a plurality of U-shaped bails, pivotally joined together at each end by a plastic joint. A fabric web ensheathes the bails and creates a shade-providing canopy when the bails are spread apart from each other in fan-like fashion. A framing bail frames a fabric sleeve and provides means for supporting the sunshade in an upright position. The sleeve non-mechanically engages the sunshade to the back portion of a chair. A cover, that extends beyond the sleeve, is used when the portable sunshade is in a folded disposition. The ends of the cover are fastened together to keep the sunshade clamped shut. A strap is provided for ease of carrying the portable sunshade.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: June 14, 1994
    Assignee: Bacchi of California, Inc.
    Inventors: Marianne Foster, Roger Beck, Lisa Beck
  • Patent number: 5318054
    Abstract: Disclosed is a spiral spring hair barrette assembly, useful for holding ponytails and other decorative hair configurations. The barrette consists of the combination of a comb and a flat spiral spring to which the comb is attached. The spiral spring has an inside and outside surface such that when the barrette spring is coiled, the inside surface coils around the ponytail being held. Projecting from the inside surface are combed teeth which also fix the barrette in place relative to the hair. The barrette is decoratively covered with fabric of various designs and materials.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: June 7, 1994
    Inventors: Kris Neilson, Terry Smith
  • Patent number: D354775
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: January 24, 1995
    Assignee: Strategium Media Inc.
    Inventor: David Dobson
  • Patent number: D356208
    Type: Grant
    Filed: May 20, 1993
    Date of Patent: March 14, 1995
    Assignee: Ariat International, Inc.
    Inventor: Pamela A. Parker