Patents Assigned to National Research Development Corp.
  • Patent number: 8216337
    Abstract: A process for the preparation of water insoluble bio-release micronutrient fertilizers, containing iron and manganese with either zinc and/or copper, comprising (a) heating orthophosphoric acid at a temperature of 130° C.-150° C. with a mixture of (i) source of iron oxide, (ii) manganese dioxide or pyrolusite, and (iii) either or both compounds of zinc or copper selected from zinc ash or zinc oxide and cupric oxide, or cupric sulphate or cupric chloride and (iii) a basic compound such as oxide or carbonate of magnesium or calcium, to produce a multi-metallic polyphosphate; (b) neutralization of the polyphosphate with a basic compound followed by drying and pulverization to obtain a solid powdery material.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: July 10, 2012
    Assignee: National Research Development Corp.
    Inventor: Chandrika Varadachari
  • Patent number: 6204670
    Abstract: A process for measuring moisture of grains, fruits, nuts and the like (a sample) by connecting the input of a multilayer microstrip hybrid circuit (MMHC) to a pulse generating source, precalibrating the pulse generating source and a time domain reflectometer and connecting the output of the MMHC to a detector. The time domain reflectometer is then calibrated to obtain a characteristic reference reflection and time of propagation through the MMHC is recorded. The sample is placed on the MMHC and a time delay is measured in response to the characteristic reference reflection. The effective permittivity is then calculated based on the parameters of the time domain reflectometer, time delay, reflection coefficient and characteristic impedance of the MMHC. The calculated effective permittivity is then calibrated against moisture.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: March 20, 2001
    Assignee: National Research Development Corp.
    Inventor: Kalpana Keshav Joshi
  • Patent number: 6152829
    Abstract: A device and a process for producing effects of waterfall, rain, garden, mountains, desert, animals, kitchen and river scenes while viewing a picture, an advertisement or playing amusement games in a cinema hall/open theater/TV is disclosed. The device includes a movie film/video tape/disc with coded signals for producing effects of waterfall, rain, garden, mountain, desert, animals, kitchen and river scenes or advertisements either recorded separately or embedded on the sound signals; an electronic decoder for decoding the coded signals when the film is moving and particular scene appears; the output of the electronic decoder is connected to an actuating device that releases gas/perfumes or energizes a heating/cooling device to produce the desired effects corresponding to the scene appearing on the screen.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: November 28, 2000
    Assignee: National Research Development Corp.
    Inventor: Sandeep Jaidka
  • Patent number: 5111042
    Abstract: A source of atomic or molecular particles includes a source of ionized particles (1), an extraction electrode (2) and an einzel lens (3) to focus a beam of particles. A Wien filter (4) selects particles in said beam having a predetermined velocity and a charge exchange cell (7) neutralizes the ionized particles prior to the extraction of non-ionized particles from the beam.
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: May 5, 1992
    Assignee: National Research Development Corp.
    Inventors: John L. Sullivan, Ning-Sheng Xu
  • Patent number: 5090240
    Abstract: A bypass flowmeter assembly has a plurality of branch pipes (11) connected in parallel with a main pipe (10), with at least one of the branch pipes having a respective flowmeter (14), and at least another of the branch pipes having respective selectively operable pipe closure means (12, 13). Preferably each branch pipe has a flowmeter and closure means. Preferably also control means (30) are provided to operate the closure means through a routine of successive phases of respectively different patterns of branch pipe flow. This allows derivation of main pipe flow rate on the basis of branch pipe flowmeter measurements with comparison of flowmeter outputs between different phases to eliminate high order measurement error, averaging of such outputs to reduce low order measurement error, or by computation to eliminate unknown factors. The assembly can be connected serially with a similar assembly (20) to monitor relative variations in the total flow of interest and adjust the actual measurement of this flow.
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: February 25, 1992
    Assignee: National Research Development Corp.
    Inventors: Roger C. Baker, Edward H. Higham
  • Patent number: 4985441
    Abstract: The invention relates to quinazoline derivatives which possess anti-tumor activity; to processes for their manufacture; and to pharmaceutical compositions containing them.The invention provides a quinazoline of the formula: ##STR1## wherein R.sup.1 is hydrogen or amino, or alkyl or alkoxy each of up to 6 carbon atoms; or R.sup.1 is substituted alkyl or alkoxy each of up to 3 carbon atoms;R.sup.2 is hydrogen, alkyl, alkenyl, alkynyl, hydroxyalkyl or halogenoalkyl each of up to 6 carbon atoms;Ar is phenylene or heterocyclene;L is a group of the formula --CO.NH-- or --CO.NR.sup.3 --, wherein R.sup.3 is alkyl of up to 6 carbon atoms; andY is hydrogen or alkyl, cycloalkyl, alkenyl or alkynyl each of up to 6 carbon atoms; orY is a group of the formula --A--Y.sup.1 in which A is alkylene of up to 6 carbon atoms and Y.sup.1 includes hydroxy, amino and cyano, and alkoxy, alkylamino and alkylthio each of up to 6 carbon atoms.
    Type: Grant
    Filed: April 3, 1990
    Date of Patent: January 15, 1991
    Assignees: Imperial Chemical Industries plc, National Research Development Corp.
    Inventors: Leslie R. Hughes, John Oldfield, Stephen J. Pegg
  • Patent number: 4913550
    Abstract: An electronic speckle pattern interferometric for measuring the movement of a vibrating body (2) uses a coherent light source (16) to illuminate the body. A television camera (4) receives radiation scattered by the body and from a reference beam (7) to form a speckle pattern. Successive measurements are stored in a frame store (8, 9) and displayed on a monitor (10).
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: April 3, 1990
    Assignee: National Research Development Corp.
    Inventors: Paul C. Montgomery, John R. Tyrer
  • Patent number: 4902110
    Abstract: A variable transmission window comprises outer panes of glass 17 and 19 and a multi layer electrochromic device allowing variation in the optical transmission properties of the window. The device comprises a transparent electrically conductive layer 12 such as indium tin oxide, an electrochromic material 13 such as a transition metal oxide bronze, a solid electrolyte 14 which is a fast ion conductor of ions of the metal which dissolves in the electrochromic material, a second electrochromic material 15, and a second transparent electrically conductive layer 16. The electrochromic material may be MoO.sub.3 or WO.sub.3. The solid electrolyte 14 may be a Bordeaux glass of LiCl, Li.sub.2 O, B.sub.2 O.sub.3. A quantity of metal colouration atoms, for example lithium, may be transferred reversibly between the electrochromic layers 13 and 15 by applying potentials to contacts 21 and 22.
    Type: Grant
    Filed: September 4, 1985
    Date of Patent: February 20, 1990
    Assignee: National Research Development Corp.
    Inventor: Mino Green
  • Patent number: 4842381
    Abstract: An electrochromic data recording device such as a disc including at least one electrochromic zone (4) in and as a part of an electrical cell (2, 4, 5, 6, 7) for selectively supplying and withdrawing guest atoms to and from the zone to produce an optical change in the zone, the cell being substantially inoperable at a first temperature but being operable at a temperature elevated with respect to the first temperature by virtue of the mobility of current carrying ions in a component of the cell which are appropriately temperature dependent. The device can be written on by laser heating the device locally to allow current to pass to produce a local optical effect and can be read by a laser and photodector in combination. Further, the device can be erased by being heated sufficiently to become conductive.
    Type: Grant
    Filed: November 17, 1987
    Date of Patent: June 27, 1989
    Assignee: National Research Development Corp.
    Inventor: Mino Green
  • Patent number: 4803289
    Abstract: Compounds of formula ##STR1## in which R represents hydrogen, formyl or an alkanoyl group of two to twenty-five carbon atoms and R' represents an alkyl group of one to thirty-five carbon atoms are of value as mosquito attractants, mosquitoes being attracted to a location where they and/or their eggs or larvae are then destroyed.
    Type: Grant
    Filed: June 8, 1983
    Date of Patent: February 7, 1989
    Assignee: National Research Development Corp.
    Inventors: Brian R. Laurence, John A. Pickett
  • Patent number: 4661339
    Abstract: A sustained release device which comprises a source of at least one trace chemical element incorporated in a cement and releasable therefrom on contact with an aqueous medium. A preferred cement is copper phosphate cement.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: April 28, 1987
    Assignee: National Research Development Corp.
    Inventors: William M. Allen, Bernard F. Sansom, Alan D. Wilson, Havard J. Prosser, David M. Groffman
  • Patent number: 4652825
    Abstract: A magnetic coil, especially for use as an r.f. transmit/receive coil in NMR apparatus, comprises a continuous closed conductive loop would round a former 1. A pair of external terminals 2 and 3 both lie in a plane 4 constituting a plane of symmetry and the coil is would so that there is mirror symmetry about this plane. There are two electrically parallel paths between terminals 2 and 3 each restricted to one side of the plane of symmetry 4 and the resultant magnetic field when a potential difference is applied between terminals 2 and 3 is such that equal magnetic fields are produced on both sides of the plane of symmetry 4.
    Type: Grant
    Filed: August 7, 1984
    Date of Patent: March 24, 1987
    Assignee: National Research Development Corp.
    Inventors: Thomas W. T. Redpath, Robert D. Selbie, James M. S. Hutchison, Linda M. Eastwood, Glyn Johnson, John R. Mallard
  • Patent number: 4649932
    Abstract: In deriving the impedance of a zone of a body errors arise when currents used stray from the zone due to movements of, and/or changes within the body. In the invention a current used for deriving impedance is passed through a zone under investigation using current electrodes outside the zone. A potential also required for deriving impedance is available at two potential sensing electrodes at ends of the zone. The current is confined to the zone by passing control currents just outside the zone between pairs of control current electrodes to set up virtual current barriers minimum along the boundaries of the zone. Pairs of potential sensing electrodes straddling the boundaries are used to adjust currents passed by the control current electrodes to establish the positions of the boundaries and to stabilize these positions when movement and/or internal functional change occurs.
    Type: Grant
    Filed: April 13, 1984
    Date of Patent: March 17, 1987
    Assignee: National Research Development Corp.
    Inventor: Denis N. Smith
  • Patent number: 4648947
    Abstract: To a conventional chromium electroplating bath containing 450 g/l chromic acid CrO.sub.3 and 4.5 g/l sulphuric acid H.sub.2 SO.sub.4 are added 10 g/l of potassium perchlorate or potassium bromate or potassium iodate or mixtures thereof. Higher current densities may be used in electrodepositing chromium without impairing the quality.
    Type: Grant
    Filed: May 1, 1985
    Date of Patent: March 10, 1987
    Assignee: National Research Development Corp.
    Inventors: John A. Naismith, Malcolm McCormick, David Howe, Malcolm A. Pate
  • Patent number: 4644783
    Abstract: A combustion chamber subject to the build-up of acoustic vibrations may have the vibrations inhibited by an electrode system which can be modulated to produce anti-noise. Sound is sensed by a microphone which may be mounted remotely to produce a control signal coupled to a voltage generator feeding the electrode system.
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: February 24, 1987
    Assignee: National Research Development Corp.
    Inventors: John P. Roberts, Maxime L. Vuillermoz
  • Patent number: 4644327
    Abstract: Existing auditory warning systems are in general too loud and it is often difficult to distinguish between a number of different warnings. Further under different conditions warnings may change character due to masking by varying noise. A warning system is disclosed which is based on a microprocessor and waveforms for each warning sound stored in a ROM. The waveforms are read out to DACs and used to drive a loudspeaker by way of programmable attenuators. Each waveform is devised to have at least four quasi-harmonically related frequency components at a power level in the range 15 to 30 dB above threshold. In this way the sounds are distinctive and do not change character with varying noise levels below threshold.
    Type: Grant
    Filed: July 20, 1983
    Date of Patent: February 17, 1987
    Assignee: National Research Development Corp.
    Inventor: Roy D. Patterson
  • Patent number: 4639158
    Abstract: A joint assembly to make firm but easily releasable contact between two components, for instance a vibration generator of magnetostrictive or piezo-electric type, an an internal plug or mandrel for use in the drawing or draw-bending of metal tube. The assembly comprising first and second ring-shaped members to engage the respective components, and an intermediate member which is fixed to one of the members and in sliding contact with the other so as to define with that other a sealed chamber of variable volume. The chamber is connected in use to a source of pressurized fluid, and when filled with such fluid the chamber is expanded and the two components are urged into firm contact.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: January 27, 1987
    Assignee: National Research Development Corp.
    Inventor: Gerald M. Jones
  • Patent number: 4638059
    Abstract: The invention provides a polysaccharide which undergoes cation-induced gelation to form gels of useful strength at relatively low concentration of cation, and which melt and set sharply and reversibly. It has a marked preference in terms of gel strength for cations of sodium rather than other Group Ia elements and calcium rather than other Group IIa elements. It contains D-glucose, L-fucose and D-glucuronate residues in the approximate molar ratio of 3:1:1. The polysaccharide can be isolated from the bacterium NCIB 11870. Its gels are useful in food and medicine for addition to a variety of foodstuffs and pharmaceuticals. They can be prepared simply by adding the appropriate cations to a dilute aqueous solution of the polymer at ambient temperature, whereupon the gel forms rapidly. If desired the gel initially formed can be melted and re-set.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: January 20, 1987
    Assignee: National Research Development Corp.
    Inventor: Ian W. Sutherland
  • Patent number: 4637048
    Abstract: Some degree of cancellation of noise from an annular noise source can be achieved by using an annular noise generator surrounding the source and in antiphase therewith. However due to the dimensions of the annulus, constructive interference may occur at frequencies of interest. In the present invention an annular noise source is surrounded by inner and outer annular noise generators generating sounds which are in antiphase and in phase respectively with sounds from the noise source. Also sounds from the inner generator are of twice the amplitude of those from the source and the outer generator. In effect over a considerable frequency range, the noise source and the outer generator have a mean position which coincides with the inner generator and together they generate sounds which are of the same amplitude but opposite phase to sounds from the generator. Thus destructive interference occurs in the said frequency range.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: January 13, 1987
    Assignee: National Research Development Corp.
    Inventor: Malcolm A. Swinbanks
  • Patent number: 4634807
    Abstract: In order to prevent the unauthorized copying of software, a software module is encrypted using the data encryption standard (DES) algorithm, and the key is encrypted using the public key of a public/private key algorithm. To use the module it is entered into a software protection device where the private key held in a RAM 11 is used by a processor 13 to decode the DES key using instructions held in a ROM 12. Further instructions held by this ROM are used by the processor 13 to decode the module. Once the process of decoding keys and software has started, the processor 13 runs through a sequence of predetermined instructions and cannot be interrupted (except by switching off). When the sequence is complete processor 13, or for example a host computer 30, is enabled to use the decoded software, but a switch/reset circuit 17 operates preventing access to the RAM 11 and the ROM 12 so preserving the secrecy of the private key and any decoded DES key which is now stored in the RAM 11.
    Type: Grant
    Filed: August 23, 1985
    Date of Patent: January 6, 1987
    Assignee: National Research Development Corp.
    Inventors: Bernard J. Chorley, Graeme I. P. Parkin, Brian A. Wichmann, Simon M. Elsom