Patents Assigned to U.S. Philips Corporations
  • Reciprocating motor-compressor with W-shaped core
    Patent number: 4992685
    Abstract: A motor-compressor unit comprising a vibration motor (1) having a single-part magnetizable stator (2) in the form of a W, arcuate air gaps (9, 10) being formed between the peripheral surface (6) of the central limb 3 of the W and each of the outer limbs (4, 5) of the W, and an armature (11) which is reciprocatingly pivotable about a motor shaft (12). The armature comprises at least one permanent magnet pole element (13), at least one coil (16, 17) arranged on the stator, an alternating current through the coil producing an oscillating movement of the armature (11), a compressor (21) having a linearly reciprocating piston (24) which is coupled to the armature (11), the coupling (25) being arranged diametrically opposite the pole element (13) relative to the motor shaft (12).
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: February 12, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Fidelus A. Boon, Evert M. H. Kamerbeek
  • Color cathode ray tube having interference filter with different pass bands
    Patent number: 4990824
    Abstract: A color cathode ray tube of the shadow mask or beam index type in which the screen structure applied to the faceplate has a plurality of triplets of optical interference filter stripes which are adapted to pass red (R), green (G) and blue (B) light produced by a homogeneous cathodoluminescent screen layer. The usual aluminium layer may be applied to the screen layer. The optical interference filter stripes may have short wave pass filters, band pass filters or a combination of both types. The short wave pass filter stripes may have modified quarter wavelength multilayer dielectric filters and the bandpass filter may have a Fabry-Perot filter.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Leendert Vriens, Johannes C. N. Rijpers, Albert A. Comberg, Johannes H. M. Wilting, Aart A. Van Gorkum, Franciscus A. Vollenbroek
  • Receiver for television and teletext signals, including a teletext decoder and an adaptive waiting time reduction circuit
    Patent number: 4991017
    Abstract: A television receiver or video recorder includes a multipage teletext, a programmed control and a non-volatile page number memory with which their teletext pages with their corresponding page numbers are stored in a page number memory. The numbers of frequently consulted pages are automatically stored in the page number memory with reference to the pattern of use, i.e., frequency of use. The number of each requested page is stored in the page number memory. The oldest page number or, if the entered number is already stored, the duplicate identical page number is removed from the memory. The page number memory then always comprises the most recently requested page numbers.
    Type: Grant
    Filed: January 3, 1990
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Thomas A. M. Raaijmakers
  • Line deflection circuit arrangement for a picture display device
    Patent number: 4990834
    Abstract: A circuit arrangement for a picture display device for generating an essentially sawtooth-shaped line deflection current with a trace and a retrace through a deflection coil, which circuit arrangement comprises a series circuit of a trace capacitor, the line deflection coil and a bidirectionally conducting, line frequency-controlled switch which is conducting during the trace time and is not conducting during the retrace time, in which retrace time the deflection coil and a retrace capacitor are part of a resonant network. The series circuit also comprises a voltage source, while the losses in the series circuit are so low that the sum of the DC components of the voltage of the source and of the voltage across the trace capacitor is many times higher, at least 5 times, than the amplitude of the AC component of the source. The deflection current is given a desired variation by means of three controls.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Age J. Van Dalfsen
  • Graphics system with graphics controller and DRAM controller
    Patent number: 4991112
    Abstract: A graphics system comprising a screen processor which separately formulates the requests for access to a single word and the requests for access to a plurality of consecutive words, a bus arbitrator to arbitrate the requests for access to a single word and to select a request, and a DRAM Dynamic Random Access Memory, controller to arbitrate the requests for a plurality of words and the refresh requests. The DRAM controller preferably comprises an automatic system which directly generates line and column control signals. The automatic system is preferably constructed in the form of a PLA (Program Logic Array).
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Jean-Michel Callemyn
  • Method for manufacturing multilayer ceramic capcitors
    Patent number: 4991055
    Abstract: A method and a device for manufacturing multilayer ceramic capacitors, in which a plate of ceramic material composed of several layers is subdivided in the green non-sintered state into separate capacitor elements. For this purpose, by means of notching members, notches of a given depth are provided simultaneously on both sides of the plate in such a manner that spontaneous ruptures are obtained through the remaining thickness of the plate. Due to this method, the contamination of the exposed electrode layers and delamination are avoided. By the use of a frame with resilient walls, the already separated capacitor elements are held together until the notching process has been carried out completely.
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Antonius G. Marneffe, Frederik G. A. Persoon, Gerard J. Scholten
  • UHF bandpass filter
    Patent number: 4990869
    Abstract: A UHF bandpass filter, comprising resonators, each of which is arranged in a respective cavity and which are coupled to one another via tracks etched on a printed circuit.
    Type: Grant
    Filed: November 1, 1989
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Pierre Chanteau, Eric Da Silva
  • Teletext decoder with improved processor which determines the beginning and end of a teletext page
    Patent number: 4991018
    Abstract: As shown in FIG. 2, a teletext decoder has a multi-page memory (MEM) comprising a plurality of memory portions (CH0 to CH3) in which individual pages can be stored on a priority basis. The numbers of selected pages are entered into page request registers (PR0 to PR3) and when the number of a selected page is detected by the relevent one of page comparators (PC0 to PC3) a found bit (FB) is produced by the relevant one of flip-flops (FB0 to FB3) and recorded in the memory portion allotted to the selected page by processor means (PM). In order to ensure that the end of a selected page can also be detected, one of the memory portions is allotted to store every page received so that a found bit is always produced at the end of a selected page stored in another memory portion. The processor means (PM) uses this latter found bit to signify detection of the end of the selected page.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Andrew K. Davies
  • Picture display device including a waveform generator
    Patent number: 4991119
    Abstract: A picture display device including a waveform generator for generating a periodical waveform for addressing picture elements of a display screen, which waveform is changeable by means of a plurality of adjusting parameters. For adjusting the desired waveform, the picture display device is adapted to perform the following technical steps:rendering a first parameter zero;determining the other parameters for obtaining the desired waveform at given locations on the display screen;based on the previous steps, establishing a relationship between the other parameters and the first parameter;determining the first parameter for obtaining the desired waveform at other locations on the display screen; andstoring the relationship and the adjusted values of the parameters.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Willebrordus G. Traa
  • Electron gun and method of manufacturing an electron gun, and display tube comprising such an electron gun
    Patent number: 4990823
    Abstract: The invention relates to an electron gun comprising a cathode-unit composed of a cathode shaft (53) which is surrounded by a heat reflection screen (56). A connection piece (55) is secured to the head end of the cathode shaft (53). A holder (59) containing electron-emitting material (60) is located on the connection piece (55). The cathode shaft (53) is suspended in the heat reflection screen (56) by means of suspension wires (57), each wire being secured to the heat reflection screen with one end which is at least close to the head end of the heat reflection screen (56), and the other end (58) being located between the connection piece (55) and the holder (59).
    Type: Grant
    Filed: September 18, 1989
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Erland C. J. Swaving, Paul J. Van Rijswijck
  • Device for inspecting an interference filter for a projection television display tube
    Patent number: 4988203
    Abstract: In a device for measuring the cut-off wavelength of an interference filter for a projection television display tube, the interference filter and a bandpass filter are arranged one behind the other. The bandpass filter has a transmission characteristic with a cut-off wavelength which approximately coincides with the desired cut-off wavelength of the interference filter, but with a slope varying in the opposite direction. A white light beam generated in a light source is incident through the two filters. The intensity, which is measured by a detector on the other side of the filters, is a measure of the cut-off wavelength of the interference filter. The device may have a second measuring system for measuring the absorption of the interference filter.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Leendert Vriens, Maurits R. T. Smits
  • Picture display device using scan direction transposition
    Patent number: 4989092
    Abstract: In a picture display device suitable for receiving and processing an incoming video signal which comprises horizontally scanned picture information and for displaying pictures which are composed of fields each of which comprises a given number of lines, a scanning section for generating line and field scanning signals for forming the lines and fields, respectively, is adapted to scan the lines in the vertical direction, a number of vertical lines constituting a field and the vertical line frequency being many times higher, at least 200 times, than the horizontal field frequency. A video signal processing section for processing the picture information which is present in the video signal comprises a scan direction transposition circuit for receiving the picture information and for sequentially assigning picture information to elements of the vertically scanned lines.
    Type: Grant
    Filed: November 28, 1989
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Terence Doyle, Leendert Vriens, Matheus J. G. Lammers
  • Radiological examination device
    Patent number: 4989228
    Abstract: A radiological examination device, comprising a base (1) which supports a patient table (2), a motor block (10) comprising a drive shaft (14) whose longitudinal axis extends transversely of the patient table, and displacement means which are linked to the motor block and which are composed of a motor block which is displaceable on a linear support (11) of the patient table, a drive chain which is rigidly connected to the motor block (10) and is closed thereon, the chain imparting, upon displacement of the motor block on its linear support, either a translatory or a rotary movement to a column which supports an X-ray imaging system.
    Type: Grant
    Filed: June 2, 1989
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Andre E. Louiday
  • Method of forming oxide superconducting layers by solid state diffusion
    Patent number: 4988672
    Abstract: A superconductive thin layer of an oxidic material is manufactured by contacting at least two starting substtances with each other, after which diffusion and a chemical reaction in the solid state occur by means of increasing the temperature, while forming the superconductive thin layer.
    Type: Grant
    Filed: February 6, 1990
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Jan W. Severin, Gijsbertus De With, Dagobert M. De Leeuw, Cornelis A. H. A. Mutsaers
  • Picture display device
    Patent number: 4988929
    Abstract: Picture display device comprising a display tube having an electron gun with an electrostatic focusing lens for generating a focusing lens field, which tube further comprises deflection means for generating a deflection field. The focusing lens field partly overlaps the deflection field. The focusing lens comprises a tubular structure having an inner surface on which a helical resistance structure of a material having a high electrical resistance is provided, which tubular structure has a coaxial input portion and a coaxial output portion, the output portion having dimensions which prevent the deflected electron beam from impinging upon the glass of the inner wall. Correction means may be provided for correcting errors caused by the advanced position of the focusing lens.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Tjerk G. Spanjer, Gerardus A. H. M. Vrijssen, Willem M. Van Alphen
  • Data processing method and apparatus for calculating a multiplicatively inverted element of a finite field
    Patent number: 4989171
    Abstract: There is described the calculation of a multiplicatively inverted element of an input vector specified in a finite major Galois field. From the set of vector coefficients there is formed a first set of linear forms and a further set of matrix-organized linear forms. The elements of the first set of linear forms are pairwise combined to quadratic forms that represent a set of coefficients of a vector defined in a subfield in the major field. This latter vector is then converted to its multiplicative inverse, after which the inverted subfield-vector has its coefficients multiplied by elements of the further set to generate the multiplicative inverse in the major field. By scrupulously combining the generation of various intermediate terms a further reduction of the necessary hardware and/or processing time is attained.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Hendrik D. L. Hollmann
  • Picture display device
    Patent number: 4988915
    Abstract: A color display tube is provided with a high resistance layer having a resistance between 10.sup.6 and 10.sup.10 ohms per square on the external portion of the tube envelope underneath the deflection coil system. The high resistance layer prevents arcing between the coil system and the envelope without adversely affecting the deflection field.
    Type: Grant
    Filed: December 27, 1985
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Antonius P. F. Zegers
  • Combined flashlight and clock
    Patent number: D314245
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: January 29, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Judith Van Brunschot
  • Combined car radio and cassette player
    Patent number: D314380
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Grant M. N. Davidson
  • Combined radio and cassette recorder
    Patent number: D314381
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: February 5, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Murray I. C. Camens