Patents by Inventor Francois t' Sas

Francois t' Sas 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: 10085721
    Abstract: A method of imaging a blood vessel includes delivering a bubble-based contrast agent within the vessel and positioning at least one ultrasound device in the vicinity of the bubble-based contrast agent within the vessel. A first burst of low-frequency ultrasound energy can be delivered to excite the bubble-based contrast agent into oscillation within the vessel, and a second burst of high-frequency ultrasound energy can be delivered at the excited bubble-based contrast agent. A return signal from the burst of high-frequency ultrasound energy can be received and processed to obtain one or more images.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: October 2, 2018
    Assignee: University of Pittsburgh - Of the Commonwealth System of Higher Education
    Inventors: Xucai Chen, Francois T. H. Yu, Flordeliza S. Villanueva
  • Patent number: 9603582
    Abstract: A method of imaging a blood vessel includes delivering a bubble-based contrast agent within the vessel and positioning at least one ultrasound device in the vicinity of the bubble-based contrast agent within the vessel. A first burst of low-frequency ultrasound energy can be delivered to excite the bubble-based contrast agent into oscillation within the vessel, and a second burst of high-frequency ultrasound energy can be delivered at the excited bubble-based contrast agent. A return signal from the burst of high-frequency ultrasound energy can be received and processed to obtain one or more images.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: March 28, 2017
    Assignee: University of Pittsburgh—Of the Commonwealth System of Higher Education
    Inventors: Xucai Chen, Francois T. H. Yu, Flordeliza S. Villanueva
  • Publication number: 20040011912
    Abstract: The invention relates to a device for automatically changing threadlike materials in a thread processing machine, comprising connecting means to connect a first thread (100) being guided from a supply to said thread processing machine, with a second thread (200) and cutting means (127) to cut said first thread through between the connecting point of the threads and the supply. The problem of the present device is, that the thread (100, 200) does not stay in a position to be selected after it has been cut through and clamped. Therefore the device (1) according to the invention is provided for keeping the first thread (100), originating from the supply, within reach of the connecting means (8, 9) after it has been cut through, in order to keep said first thread (100) in a position.
    Type: Application
    Filed: April 3, 2003
    Publication date: January 22, 2004
    Inventor: Francois t' Sas
  • Patent number: 5475394
    Abstract: In a flat plate antenna, insertion loss is reduced significantly by providing an extensive waveguide structure at the back of the ground plane of the antenna. Depending on antenna size, the waveguide may feed the antenna at one or a plurality of points. According to a preferred embodiment, the transition from waveguide to stripline is made via a coaxial connection, with a quarter-wave transformation, including mode suppression walls to direct the energy more efficiently. Alternatively, a direct waveguide to stripline transition may be provided. The technique has wide applicability to a number of antenna designs, including single- and dual-polarization structures, and linear and circular polarization operation.
    Type: Grant
    Filed: August 18, 1994
    Date of Patent: December 12, 1995
    Assignee: Comsat Corporation
    Inventors: Eric C. Kohls, Robert M. Sorbello, Bernard D. Geller, Francois T. Assal
  • Patent number: 5220320
    Abstract: A "modified rearrangeable" switch matrix combines both .beta. switching elements and crossbar switch matrices in a single switch configuration, with .beta. switching elements used at the input and output and at least one crossbar switch matrix in the middle to receive its inputs from .beta. switching elements and provide its outputs to .beta. switching elements.
    Type: Grant
    Filed: February 10, 1992
    Date of Patent: June 15, 1993
    Assignee: COMSAT
    Inventors: Francois T. Assal, John V. Evans, Christoph E. Mahle, Amir I. Zaghloul, Ramesh K. Gupta
  • Patent number: 4931802
    Abstract: On-board satellite switching is performed in three stages, an outer stage of switching on the up-link side for routing the received signals to either demodulators or frequency translators, a first inner stage of switching, preferably a baseband switch and processor, for routing and processing the outputs of the demodulators, a second inner stage of switching, e.g., a microwave switch matrix, for routing the outputs of the frequency translators, and an outer stage on the down-link side for assembling and routing the down-link spot beams. For a multiple hopping-beam system, the outer stages are microwave switch matrices, and for a hybrid scanning-hopping system the outer stages are beam forming matrices. A general purpose modified rearrangeable switch matrix is also disclosed.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: June 5, 1990
    Assignee: Communications Satellite Corporation
    Inventors: Francois T. Assal, John V. Evans, Christoph E. Mahle, Amir I. Zaghloul, Ramesh K. Gupta
  • Patent number: 4868886
    Abstract: In antenna arrays having normally unexcited or little-excited elements, a technique for configuring the array to provide both global and spot beam coverage, wherein the normally unexcited or little-excited elements are excited at a higher level, together with other normally excited elements to provide spot beam coverage, the normally unexcited elements being left unexcited to provide global beam coverage. Ring redundancy configurations for amplifiers in a transponder provided in the configuration are optimized to minimize additional hardware requirements. The specific example of the INMARSAT II satellite system is discussed.
    Type: Grant
    Filed: June 14, 1988
    Date of Patent: September 19, 1989
    Assignee: Communication Satellite Corporation
    Inventors: Francois T. Assal, Amir I. Zaghloul
  • Patent number: 4637017
    Abstract: A method of measuring input-backoff to an amplifier in a time-division multiple access (TDMA) communication system having a carrier recovery segment and a clock recovery segment prior to a data segment in a traffic burst. A monitoring station transmits a CW pilot signal within the amplifier's bandwidth. In the guard time between bursts, the monitoring station measures the unsuppressed pilot level output by the amplifier. While a ground station is transmitting an unmodulated carrier during carrier recovery or a carrier modulated at the clock frequency during clock recovery, the monitoring station measures the suppressed pilot level, suppressed by the non-linear interaction of pilot and carrier. The amount of pilot suppression is related to the input power back-off of the carrier by a previously measured or a theoretically derived relationship.
    Type: Grant
    Filed: May 21, 1984
    Date of Patent: January 13, 1987
    Assignee: Communications Satellite Corporation
    Inventors: Francois T. Assal, Arnold L. Berman, Janaki R. Potukuchi
  • Patent number: 4458618
    Abstract: The device renders unsinkable a boat such as a habitable boat having a cabin and a cockpit. The device comprises three inflatable envelopes two of which are placed on starboard side and port side bunks respectively whereas the other envelope is placed on the floor of the cabin between the two bunks. A compressed gas container controlled by a valve is connected to all the envelopes for inflating the envelopes when required.
    Type: Grant
    Filed: February 10, 1982
    Date of Patent: July 10, 1984
    Assignee: Rosa Tuffier nee Boubis
    Inventor: Francois T. N. Tuffier
  • Patent number: 4346090
    Abstract: 13-Chloro-octahydrobanzo[6,7]cyclohepta[1,2,3-de]pyrido[2,1-a]isoquinolin-5 -ols, substituted on the piperidine ring with lower alkyl or a cycloalkyl are disclosed. The compounds are useful CNS depressants. Methods for their preparation and use also are disclosed.
    Type: Grant
    Filed: July 21, 1977
    Date of Patent: August 24, 1982
    Assignee: Ayerst, McKenna & Harrison Ltd.
    Inventors: Leslie G. Humber, Francois T. Bruderlein, Andre A. Asselin
  • Patent number: 4267538
    Abstract: A microwave PIN diode switch is provided with circuitry to achieve impedance matching at both input and output ports and for both "on" and "off" switching states.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: May 12, 1981
    Assignee: Communications Satellite Corporation
    Inventors: Francois T. Assal, Arnold L. Berman, Khodadad Betaharon
  • Patent number: 4151489
    Abstract: A four-port waveguide switch is described which allows any two pairs of ports to be connected together. A separate waveguide independently connects each port with each of the remaining ports. In each of the six separate waveguides there is provided at least one resonant cavity having a passband that includes the frequencies of the incident microwave signals to be switched. A disrupting structure is provided for each resonant cavity. Each disrupting structure may be switched between a first state wherein the respective cavity is not detuned and a second state wherein the respective cavity is detuned such that it reflects the incident microwave signals. By switching the appropriate disrupting structures to their second state, any of the three possible connecting states of a four port switch of the present invention can be obtained.
    Type: Grant
    Filed: November 15, 1977
    Date of Patent: April 24, 1979
    Assignee: Communications Satellite Corporation
    Inventors: Arnold L. Berman, Christoph E. Mahle, Francois T. Assal
  • Patent number: 4062851
    Abstract: An efficient, commercially feasible process for the resolution of the organic bases, (.+-.)-(4a,13b-trans)-(3-hydroxy,13b-trans)-3-isopropyl-2,3,4,4a,8,9,13b,1 4-octahydro-1H-benzo[6,7]cyclohepta[1,2,-3-de)pyrido[2,1-a]isoquinolin-3-ol and (.+-.)-(4a,13b-trans)-(3-hydroxy,13b-trans)-3-tert-butyl-2,3,4,4a,8,9,13b, 14-octahydro-1H-benzo[6,7]cyclohepta[1,2,3-de]pyrido[2,1-a]isoquinolin-3-ol , known neuroleptic agents, is disclosed. The process comprises resolving the racemic organic bases with L-(+)-tartaric acid to obtain directly the pure L-(+) tartrate of the (+)-enantiomer and converting the latter salt to the corresponding (+)-enantiomer free base.
    Type: Grant
    Filed: November 26, 1975
    Date of Patent: December 13, 1977
    Assignee: Ayerst McKenna and Harrison Ltd.
    Inventors: Karel Pelz, Francois T. Bruderlein, Leslie G. Humber
  • Patent number: 4059585
    Abstract: Disclosed is a process for preparing (4a,13b-trans)-1,2,4,4a,8,9,13b,14-octahydro-3H-benzo[6,7]cyclohepta[1,2,3 -de]-pyrido[2,1-a]isoquinolin-3-one involving a 1,3-cycloaddition of a 4-halo-1-butene to 1,7,8,12b-tetrahydrobenzo[1,2]cyclohepta-[3,4,5-de]isoquinoline N-oxide.
    Type: Grant
    Filed: July 27, 1976
    Date of Patent: November 22, 1977
    Assignee: Ayerst McKenna and Harrison Ltd.
    Inventor: Francois T. Bruderlein
  • Patent number: 4054569
    Abstract: Octahydrobenzo[6,7]-(or [5,6]-)cyclohepta-[1,2,3-de]pyrido-(or pyrrolo-)[2,1-a]isoquinolines, and decahydrobenzo[6,7]-(or[5,6]-)cyclohepta[1,2,3-de]-azepino[2,1-a]isoquinol ines and derivatives thereof, optionally substituted on the pyrrolidine, piperidine or azepine ring. The compounds are useful CNS depressants, anticonvulsant and antiinflammatory agents, and methods for their preparation and use are also disclosed.
    Type: Grant
    Filed: May 17, 1976
    Date of Patent: October 18, 1977
    Assignee: Ayerst McKenna & Harrison Ltd.
    Inventors: Francois T. Bruderlein, Leslie G. Humber
  • Patent number: 3985751
    Abstract: Octahydrobenzo[6,7]- (or [5,6]-) cyclohepta-[1,2,3-de]pyride- (or pyrrolo-) [2,1-a]isoquinolines, and decahydrobenzo[6,7]- (or [5,6]-) cyclohepta[1,2,3-de]-azepino[2,1-a]isoquinolines and derivatives thereof, optionally substituted on the pyrrolidine, piperidine or azepine ring. The compounds are useful CNS depressants, anticonvulsant and antiinflammatory agents, and methods for their preparation and use are also disclosed.
    Type: Grant
    Filed: October 29, 1974
    Date of Patent: October 12, 1976
    Assignee: Ayerst McKenna and Harrison Ltd.
    Inventors: Francois T. Bruderlein, Leslie G. Humber