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| Number | Title | Issue Date |
| 5100524 | Apparatus for selectively coating part of a member Apparatus for selectively coating part of a member with a material, such as plating the walls of a hole in a printed circuit board, may include two heads which, during operation of the apparatus, form a passageway between them through the hole. A pump alt... | 03/31/1992 |
| 5013114 | Optical switch apparatus An optical switch apparatus comprises two optical waveguides, which may be formed by diffusing titanium into a lithium niobate body. Electrode are bonded to the surface of the body and are arranged such that an electric field may be applied across the bod... | 05/07/1991 |
| 4999741 | Package in the heat dissipation of Electronic devices Many housings for electronic devices require to be carefully sealed, as well as incorporate heat sinks for the electronic devices. Careful sealing has required expensive machined housing joints and, because electronic devices may be misaligned to the subs... | 03/12/1991 |
| 4983986 | Slot antenna A triplate fed slot antenna in which a conductive sheet has a slot with a length of λ, where λ is the wavelength of a signal intended to be radiated from or received by the antenna. A triplate feed structure is coupled for feeding the slot. The triplate... | 01/08/1991 |
| 4983987 | Antenna An antenna capable of producing circularly polarized radiation is formed by two non-coaxial cross dipoles.... | 01/08/1991 |
| 4972193 | Target recognition Apparatus for recognizing a target such as a ship comprises a radar for successively sweeping the target to obtain input data representing the return amplitude from different target angles; a filter for selecting from the input data those significant rang... | 11/20/1990 |
| 4967200 | Processor for radar system In a synthetic aperture radar system the radar pulse echo return signals are sample, which samples are correlated with a replica of the original signal to produce range line samples with increased resolution in the range direction. To increase resolution ... | 10/30/1990 |
| 4965827 | Authenticator An authenticator for digital data is derived by generating a numerical array, using a secret key to controllably shift the relative positions of the elements of the array, and applying the scrambled array to a message to create an authenticator for that m... | 10/23/1990 |
| 4949174 | Zoom lens thermal imager incorporating a non-pixellated detector A thermal imaging device comprises a non-pixellated detector (3) which includes a component (12), such as a liquid crystal element, having optical properties which vary with temperature. An infra-red lens (1) forms a focused image of a thermal scene on th... | 08/14/1990 |
| 4945539 | Acousto-optic tunable filter An acousto-optic tunable filter, for laser tuning, comprises an acoustic transducer connected to one face of an anisotropic crystal or Bragg cell which is cut at such an angle relative to its optic axis that an acoustic wave projected into the crystal nor... | 07/31/1990 |
| 4912482 | Antenna An antenna includes an array of electrically conductive cells each having one open side and containing a radiating/receiving element. The conductive cells reduce mutual coupling between elements.... | 03/27/1990 |
| 4906062 | Integrated optical waveguide bend An integrated optic device comprises a strip-like waveguide having a Z-bend to provide a lateral offset. Weak lateral guiding in the waveguide is provided by giving the waveguide a higher effective refractive index than that of the remaining material in t... | 03/06/1990 |
| 4899036 | Transaction system A transaction system enables a portable token to co-operate with a fixed terminal. The token is inductively coupled to the terminal, and receives data from the terminal via a frequency modulated carrier signal. Data is sent from the token to the terminal ... | 02/06/1990 |
| 4890107 | Analogue-to-digital converter An analogue-to-digital converter in accordance with the invention comprises a feed-forward arrangement in which, in a first stage, the analogue input signal is applied via a filter to a subtractor along a first path and is applied via a second path to an ... | 12/26/1989 |
| 4864311 | Beam forming network A beam forming network employing a matrix of resistive coupling elements to link individual elements E1 to En of an antenna to the different phase terminals 3, 4, 5 and 6 of a phase combiner. Because of unwanted coupling between the ... | 09/05/1989 |
| 4837425 | Security arrangement A security arrangement includes a token in the form of a thin lamina which co-operates with a receptor. The token includes an optically readable pattern in the form of a bar code, and a thin film holographic reflector which deflects the light which is mod... | 06/06/1989 |
| 4833932 | Stabilised mount A stabilised mount (e.g. for an antenna) has two gyroscopic rotors mounted in such a way that they can pivot about orthogonal axes. Rewinding of the antenna (to avoid undue twisting of the electrical cables) is liable to cause a voilent destabilisation of... | 05/30/1989 |
| 4833484 | Earth terminal for satellite communication An earth terminal for a satellite communication system incorporates an oval or eliptical shaped antenna 1 whose horizontal dimension d1 is greater than it's vertical dimension d2. The relatively small dimension d2 allows t... | 05/23/1989 |
| 4812135 | Flexible electrical connectors Flexible electrical connectors are employed to connect rigid members, such as plugs and printed circuit boards. Such connectors have a tendency to tear, especially in the region near the rigid member, and this can prove expensive to remedy. The invention ... | 03/14/1989 |
| 4797844 | Digital mixing apparatus which attenuates the sum frequency of the mixed signals In a radar receiver signals at IF are converted to digital form at 22 and the real and imaginary components are separated at 24 and 25 before passing to respective digital low-pass filters 28 and 29. These filters operate by adding samples within blocks o... | 01/10/1989 |
| 4797640 | Apparatus for amplitude modulating the output of a laser diode or L.E.D. The output of a laser diode or L.E.D. is amplitude modulated by varying the forward current through it. This is done by applying a dc current component from a first current source and an ac current component from another part of the circuit. The ac curren... | 01/10/1989 |
| 4772786 | Photothermal oscillator force sensor A sensor comprises a beam, e.g. of silicon, which resonates at a frequency dependent on the force imposed on the beam. Light on a line induces resonance of the beam by means of the photothermal effect. The light reflected from the beam is amplitude modula... | 09/20/1988 |
| 4767047 | Desoldering device A device for removing a component from a substrate to which it is secured by solder. The device has a moveable member which defines a space to which suction can be applied. The space has an opening which can be positioned against the component so as to ho... | 08/30/1988 |
| 4761622 | Waveguide switching apparatus Waveguide switching apparatus includes a stator and a rotor arranged to rotate relative to it. The rotor includes passages therethrough arranged to make connections between channels in the stator depending on the relative position of the rotor and stator.... | 08/02/1988 |
| 4466133 | Radio receiver apparatus including multipath fade compensating arrangement In a radio receiver a multipath fade compensating circuit comprises a single-pole filter circuit the center frequency and Q of which are controlled in dependence upon the amplitudes of signal components in narrow frequency bands within the band of frequen... | 08/14/1984 |
