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| Number | Title | Issue Date |
| 5052004 | Tunable lasers A tunable laser having a range of possible emission frequencies has a Bragg cell mounted inside its laser cavity such that only light passing through the Bragg cell without Bragg deflection will be emitted by the laser.... | 09/24/1991 |
| 4951213 | Vehicle navigation An aircraft navigation system uses an infra-red scanner to provide an image of the ground, and a laser doppler system to measure the speed of the aircraft relative to the ground. The apparent movement relative to the aircraft of features in the image is e... | 08/21/1990 |
| 4929950 | Synthetic aperture radar systems In a synthetic aperture radar system, information concerning the radar reflectivity of a point on the ground is placed in an image at an azimuthal (cross-range) position which corresponds to the position of zero Doppler frequency shift of the received sig... | 05/29/1990 |
| 4879559 | Azimuth processor for SAR system having plurality of interconnected processing modules Synthetic aperture radar is a known system for producing a high resolution image of the terrain under a moving platform, in which the effect of a large antenna (which would give high resolution in the direction of travel (azimuth direction)) is synthesize... | 11/07/1989 |
| 4845347 | 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 ... | 07/04/1989 |
| 4806760 | Radiation detectors having mechanical resonation Infra-red from a field of view is periodically interrupted before being incident on a mechanically resonant detector. Resonation of this caused by the photo-acoustic effect is detected by an optical beam.... | 02/21/1989 |
| 4783841 | Data compression The present invention enables compression of digitized pictorial data to be achieved by comparing a data block of a predetermined size with a group of patterns relevant to that size held in a library. If a match is found the data block is represented by a... | 11/08/1988 |
| 4733292 | Preparation of fragile devices A method of fabricating a generally planar device such as a lead frame, having fragile portions contiguous respectively with relatively robust portions, which includes in sequence, the steps of providing a robust, generally sheet-like blank, removing mate... | 03/22/1988 |
| 4719134 | Solderable contact material It is often required to solder an electrical connection to a component or a lead thereto via a contact pad. At present pads are commonly of materials that tend to oxidize during any subsequent heat processing of the device, and are then difficult to solde... | 01/12/1988 |
| 4714930 | Antenna feed polarizer This invention relates to rotatable antenna feed polarizers for use in communication antenna systems, and seeks to provide, at economic cost, an antenna feed polarizer which is capable of being rotated accurately. The polarizer is rotated by a threaded member ... | 12/22/1987 |
| 4671655 | Exposure meter An exposure meter includes a display device 16 on which is displayed a histogram 17. The x axis is divided into cells representing ranges of possible luminance values. The height (i.e., y value) of each cell of the histogram represents the number of indiv... | 06/09/1987 |
| 4652887 | Antenna drive An antenna is pivoted on a mounting about a first axis (3) and is driven by a screw threaded drive member (5) to which it is pivoted about a second axis (4). The drive member (5) engages a drive mechanism (6) which is pivoted about a third axis (7) all th... | 03/24/1987 |
