Patents Examined by Bernarr Earl Gregory
  • Patent number: 5007084
    Abstract: A Payment Authorization and Information Device for users of credit cards and other forms of credit receives billing information by tape or the like from the provider of the credit cards or from any such provider of credit. In the preferred embodiment, such information, encoded and identified as to the particular user, is broadcast during the retrace time of a television broadcast signal. A user has a receiver that is tuned to the particular channel in which the credit information is broadcast. A Payment Authorization and Information Device at the user's location is enabled to read the billing information into memory and tell the user that he has been billed. The Payment Authorization and Information Device is connected by a modem to the telephone line to signal the provider or the Information Center that the information has been received.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: April 9, 1991
    Assignees: Richard H. Materna, John S. Linse
    Inventors: Richard H. Materna, John S. Linse, Roy A. Richardson
  • Patent number: 5007085
    Abstract: A data processing system is disclosed which is equipped with a secure user friendly input system. The input system comprises an array of horizontal and vertical conductor supported on a flexible, transparent overlay membrane secured to the viewing surface of the display of an individual workstation and a remotely sensed personal stylus. The stylus is equipped to receive electromagnetic signals from the array and transmit signals containing information concerning the stylus position on the overlay and stylus ID to a receiver at the workstation. The input system also includes a control processor operating in stored program instructions which control the detection and log-on procedures for the remotely sensed personal stylus.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: April 9, 1991
    Assignee: International Business Machines Corporation
    Inventors: Evon C. Greanias, Robert L. Donaldson
  • Patent number: 5007083
    Abstract: A computer or communication system having physically secure vault means which include data source, receiver and decoder-encoder (cryptosystem). Data outside the vault means is coded and thereby protecting its loss from electronic tapping. Clear data inside the vault means is protected by the vault.
    Type: Grant
    Filed: January 16, 1985
    Date of Patent: April 9, 1991
    Inventor: James N. Constant
  • Patent number: 5003599
    Abstract: An in-band framing encoder, for continuously operating on bit stream having external-framing data and payload data. The bit stream includes a plurality of time-division-multiplexed frames of payload data achieving channel integrity with external-framing data. The encoder comprises a framing-bit detector and a framing-bit remover for detecting the external-framing data of the bit stream, and removing the external-framing data from the bit stream. A unique-bit-pattern generator generates a unique-bit-pattern sequence. A multiplexer multiplexes the unique-bit-pattern sequence with payload data over the plurality of time-division-multiplexed frames of payload data, thereby generating internally-reframed data having the unique-bit-pattern sequence multiplexed with the payload data.
    Type: Grant
    Filed: February 7, 1989
    Date of Patent: March 26, 1991
    Assignee: Simulation Laboratories, Inc.
    Inventor: James Landry
  • Patent number: 5003591
    Abstract: A cable television converter with remotely modifiable functionality receives firmware downloaded over a cable television network. The integrity of the firmware is verified, and if valid, the firmware is executed to provide one or more converter functions. If the firmware is invalid, default operation software contained in ROM is executed instead of the firmware to return the converter to baseline operation. In one embodiment, the converter includes a frequency agile data receiver to receive control instructions on a first data channel and firmware on a second data channel. The receiver is forced back to the first channel if a successful firmware download does not occur on the second channel within a predetermined time period. The firmware is continuously transmitted in short segments, and the converter can continue to receive segments until all the segments of a designated firmware package have been successfully downloaded, unless the predetermined time limit expires sooner.
    Type: Grant
    Filed: May 25, 1989
    Date of Patent: March 26, 1991
    Assignee: General Instrument Corporation
    Inventors: Marc W. Kauffman, Michael R. Miller
  • Patent number: 5003595
    Abstract: This invention relates to a method and apparatus for making it difficult for unauthorized callers to access a target computer such as a data base for providing data to and accepting orders from agents. The caller is identified by an arrangement that is relatively secure from tampering. The caller's telephone number is identified by Automatic Number Identification (ANI) and forwarded to an adjunct processor associated with the target computer. The ANI number is compared with a stored list of authorized ANI numbers and if there is a match, the caller is connected to the target computer. The arrangement also provides other facilities including automatic rejection of calls from a second list of ANI numbers, trapping of calls from a third list of ANI numbers and facilities for permitting authorized agents calling from unauthorized numbers to access the target computer.
    Type: Grant
    Filed: August 29, 1989
    Date of Patent: March 26, 1991
    Assignee: AT&T Bell Laboratories
    Inventors: Cynthia B. Collins, Francis T. Lynch, Kay L. Mueller
  • Patent number: 5003593
    Abstract: A secure teleconferencing method for a key management system is shown. This method directly establishes a secure teleconference among a number of terminals without the intervention of a certifying authority. The terminals of this system have been previously certified by a common certification authority. Upon detection of a secure teleconference, the terminals orient themselves in a master/slave configuration. The terminals exchange certification messages. As a result, each terminal determines the identity of the other terminals. Under the supervision of the master terminal, the terminals establish a single session, session key which permits secure communication among the terminals. A new session key is pseudorandomly generated for each teleconference call. A minimum number of messages is exchanged to establish the secure teleconference.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: March 26, 1991
    Assignee: Motorola, Inc.
    Inventor: Thomas J. Mihm, Jr.
  • Patent number: 5003600
    Abstract: A finely detailed defraction grating is applied to an object as an identifier or tag which is unambiguous, difficult to duplicate, or remove and transfer to another item, and can be read and compared with prior readings with relative ease. The exact pattern of the defraction grating is mapped by diffraction moire techniques and recorded for comparison with future readings of the same grating.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: March 26, 1991
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Vance A. Deason, Michael B. Ward
  • Patent number: 5003596
    Abstract: A cryptographic system creates a key table from a single key such that the relationship between the keys in the key table cannot be determined even if the system implementation is known. The system uses variable functions in which the determinants are changed by the variable function chosen by the determinant. Thus, the functions used in creating the key table do not have to be one-to-one functions. From the key table, four blocks of bytes of additional key based determinants are formed which are called masks. The original key does not exist in either the key table or the mask table. The system preferably uses the key table in a multiple round encryption process. The keys chosen from the table for a key addition operation are a function of the plaintext, the current state of the ciphertext, and the mask values. Therefore, the order in which the keys are chosen is not predetermined or patterned.
    Type: Grant
    Filed: August 17, 1989
    Date of Patent: March 26, 1991
    Assignee: Cryptech, Inc.
    Inventor: Michael C. Wood
  • Patent number: 5001753
    Abstract: The subject of the present invention is a cryptographic system, having two inverse permutations, which can be implemented in a (micro) computer whose data processing resources are relatively limited. The two inverse permutations are processed with one and the same table, and the data zones, before and after permutation, occupy only one and the same memory zone. Applied to the DES cryptographic system, this can in particular be implemented in the memory card for the purpose of ensuring the security of transmissions between the card and a communication system; in particular the card reader of this system.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: March 19, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Marc Davio, Philippe Gautier, Willem Isphording, Jean-Jacques Quisquater, Herve/ Sizabuire
  • Patent number: 5001749
    Abstract: A printing medium for the printing of images thereon to form a document by the printer of a standard facsimile machine in a manner which renders the document unreadable to a casual observer. There is a strip of a flexible printing medium receivable by the facsimile machine for passage therethrough past the printer thereof. The printing medium has a surface for receiving an image from the printer. Additionally, there is a strip of an obscuring medium removably attached to the printing medium along an edge thereof in a manner which will allow the obscuring medium to pass through the facsimile machine in combination with the printing medium. The obscuring medium has an obscuring portion covering a printing surface of the printing medium upon which the printer prints images for rendering printing on the printing medium unreadable to a casual observer. Four embodiments are disclosed for use in both thermal and plain paper facsimile machines.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: March 19, 1991
    Inventors: Jerry R. Iggulden, Donald A. Streck
  • Patent number: 5001750
    Abstract: A secret communication control apparatus used to effect secret communication with communication equipment, for example, facsimile equipment, which transmits picture information by use of public communication lines. When a communication control code that is utilized to set a communication mode is to be transmitted, the intervention of the secret communication control apparatus in the communication is suspended by switching a change-over switch, so that the main body of the local communication equipment and the remote communication equipment perform direct transmission of the communication control code therebetween without passing it through the secret communication control apparatus. It is therefore possible to transmit the signal in the minimized time, that is, in the same way as in the case of ordinary, nonsecret communication.
    Type: Grant
    Filed: March 7, 1990
    Date of Patent: March 19, 1991
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Hideharu Kato, Yoshihiro Naruse, Yoshifumi Iwata
  • Patent number: 5001723
    Abstract: A spread spectrum communications system is described for recovering data from a signal having a first carrier frequency modulated by one of at least four phase modulations, each phase modulation orthogonal to one another and the signal further modulated by a predetermined spreading function incorporating a frequency synthesizer for generating a plurality of frequencies, including one of the phase modulations, a plurality of mixers, a combiner, a broadband convolver, a second combiner coupled to a reference signal generator for generating respective orthogonal modulations on spaced apart carrier frequencies, a power divider coupled to the output of the convolver and filters each having a frequency passband for recovering or separating the output signals of the convolver. The invention overcomes the problem of additional hardware complexity to accomodate Walsh orthogonal functions and of requiring a plurality of broadband convolvers to decode a plurality of orthogonal modulations of lesser bandwidth.
    Type: Grant
    Filed: November 5, 1985
    Date of Patent: March 19, 1991
    Assignee: Allied-Signal Inc.
    Inventor: Leo A. Kerr
  • Patent number: 4998279
    Abstract: A personal verification system comprising a user device which is adapted to generate a time varying, multi-character, nonpredictable code; a verification device; a mechanism for permitting the user to communicate the nonpredictable code generated by the user device at a given time to the verification device in a manner such that a biocharacteristic of the user is communicated with each code character; the verification device including a mechanism for generating the same nonpredictable code as is appearing at the user device at the given time, a mechanism for converting each character of the generated nonpredictable code to an indication of the character which includes the biocharacteristic; and, a mechanism for comparing the communicated characters including biocharacteristics with the character indications including biocharacteristic, and a mechanism for indicating verification if the compared characters, including the biocharacteristic, match in a predetermined way.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: March 5, 1991
    Inventor: Kenneth P. Weiss
  • Patent number: 4998261
    Abstract: In a digital data receiver (80) for demodulating a direct sequence spread spectrum differential phase shift keyed data signal, the signal is applied to the input transducer (140) of a SAW device (100) which has first and second output transducers (142, 144) spaced apart on the SAW substrate (130) so as to produce first and second output signals on output lines (102, 104), which are relatively delayed by a time corresponding to a symbol period. The output transducers are of identical construction and are matched to the spread spectrum code utilized in the data signal. Thus, a single SAW device (100) effects both correlation and delay. The output signals on the output lines (102, 104) are processed by a circuit including multipliers (106, 110) and a phase shifter (108) to produce output data signals representing the received data.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: March 5, 1991
    Assignee: NCR Corporation
    Inventors: Hans van Driest, Jacobus C. Haartsen, Bruce T. Tuch, Maarten Visee
  • Patent number: 4996711
    Abstract: Digital signature techniques are disclosed in which exponents may be selected by the message to be signed itself, by the signing party, by the party providing the message to the signing party for signature, and/or by a party to whom the signature is shown. When a message selects the exponent(s), the need for "hash functions" in known signature schemes is overcome. When the exponent is chosen by the party receiving the signature, to take another example, computation, storage and bandwidth requirements of known one-show blind signature systems may be improved. Also, the bank cannot falsely incriminate a payer for showing a signature more than once, even if the bank has unlimited computing resources.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: February 26, 1991
    Inventor: David L. Chaum
  • Patent number: 4995078
    Abstract: A television broadcast system using land lines is provided for real-time transmission of a viewer-chosen program at a viewer requested time to the requesting viewer's television receiver. The preferred method includes the steps of providing a collection of stored programs, communicating the requesting viewer's choice of a program chosen from the collection and a requested time for viewing the chosen program, selecting the chosen program from a collection, transmitting the chosen program at the requested time for viewing on the requesting viewer's receiver, and preventing intelligible viewing of the chosen program on other receivers.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: February 19, 1991
    Inventors: H. Vincent Monslow, Steven R. Dickey
  • Patent number: 4995081
    Abstract: The method and system for the invention utilizes any of a number of "proofs of legitimacy" to generate and verify a personal identification card. A card is generated by computing a digital signature of a non-secret password. The password and the digital signature are then encoded and stored on a magnetic stripe or other memory device of the card. To effect a transaction, the digital signature on a received card must be shown to have been generated from the password on the received card. The password preferably includes a digitized photograph of the authorized cardholder which is capable of being displayed at the transaction terminal. This enables the operator of the terminal to verify the identity of the cardholder by visual inspection.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: February 19, 1991
    Inventors: Frank T. Leighton, Silvio Micali
  • Patent number: 4995080
    Abstract: A method of operating a pay per view (PPV) television system includes transmitting global data packets alternately encrypted with two different session keys. Subscriber terminals store three session keys, and automatically sequence through the session keys in an ateempt to decrypt the data packets. A program tag in the global data packet identifies a television program and a memory location in the subscriber authorization memory and may also include a tag identifying an upcoming program for which the subscriber may self-authorize his terminal by accessing the memory location identified by the PPV tag. The program tag is required to enable the subscriber terminal descrambling means to descramble the accompanying television program. Subscriber terminals are periodically polled by addressed data packets whereupon the contents of their authorization memories are sent to the cable heat-end for billing purposes. After successful polling, a new session key is downloaded to the subscriber in an addressed data packet.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: February 19, 1991
    Assignee: Zenith Electronics Corporation
    Inventors: Caitlin B. Bestler, Richard W. Citta, Michael E. Long
  • Patent number: 4991207
    Abstract: In one way address transmission system of a PCM music broadcasting, a plurality of the PCM signals are time divisionally multiplexed and then the multiplexed data is scrambled for transmission. An address code in the transmitted scrambled data is arranged so that only the contracted receiver can descramble the address code.
    Type: Grant
    Filed: March 21, 1989
    Date of Patent: February 5, 1991
    Assignee: Kabushiki Kaisha Kenwood
    Inventors: Kenichi Shiraishi, Hirokazu Kobayashi