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| Number | Title | Issue Date |
| 6429776 | RFID reader with integrated display for use in a product tag system A product tag system comprises: an RFID tag adapted for attachment to a product; a data store in the tag for bar code information relating to the product; a tag detacher for removing the tag from the product at a point of sale; an RFID tag reader for retr... | 08/06/2002 |
| 5777743 | Scribe mark reader A scribe mark reader (10) uses a source of circularly polarized light and a holographic beam-shaping optical element (40) to uniformly illuminate an area of a substrate (20) that includes a scribe mark (18). Light incident on the substrate at a scribe mar... | 07/07/1998 |
| 5631456 | Reflection control apparatus A device for controlling reflections off of and information-bearing surface is especially suitable for use in conjunction with shiny, curved surfaces containing machine-readable markings. The device includes a chamber having an interior wall and entrance ... | 05/20/1997 |
| 5537431 | Method and apparatus for bar code reading and decoding A method and apparatus reliably and robustly decode single width bar codes that may be placed on a variety of materials. The decoding is independent of whether or not the bar code represents dark bars on a light background or light bars on a dark backgrou... | 07/16/1996 |
| 5528023 | Bar code detecting circuitry A wide bandwidth slope detector has a comparator with first and second time constant circuits coupled to first and second inputs thereof. Where one time constant is on the order of three times the other, the comparator will change state in response to the... | 06/18/1996 |
| 5461223 | Bar code detecting circuitry A wide bandwidth slope detector has a comparator with first and second time constant circuits coupled to first and second inputs thereof. Where one time constant is on the order of three times the other, the comparator will change state in response to the... | 10/24/1995 |
| 5298731 | Method for printing and reading for orthogonal bar code patterns A data processing system, and method combine two alphanumeric data streams into a single bar code representation. Storing a first conversion table converts a first sequence of alphanumeric characters into a corresponding sequence of first bar code charact... | 03/29/1994 |
| 5298727 | Device for reading bar codes on semiconductor surfaces A device for reading a bar code applied to a semiconductor wafer includes a laser source producing a coherent diverging light beam along a first optical path. An optical transmit/receive (T/R) unit has a first focal point on the first optical path upstrea... | 03/29/1994 |
| 5184005 | Non-decoded type bar code reading apparatus A bar code reading apparatus for optically reading a bar code comprising bars and spaces successively and alternately arranged to output a digital signal to a decoder placed at the reading apparatus. The reading apparatus includes a conversion circuit for... | 02/02/1993 |
| 5175425 | Process for marking semiconductor surfaces The bar code (Sk) for marking semiconductor surfaces includes a plurality of parallel bar elements (Se) having identical widths (b), wherein every bar element (Se) is formed as a series of overlapping softmark melting points (SSp) produced by means of las... | 12/29/1992 |
| 5015832 | Method of and apparatus for decoding bar code symbols A method and an apparatus scan a light beam (62) along an arcuate scan path (148 and 150) across a bar code symbol (48) to decode it. In a preferred embodiment, a robotic semiconductor wafer handler (10) rotates a fixed-beam optical scanning assembly (44)... | 05/14/1991 |
| 4825093 | Methods for identifying semiconductor wafer with bar code pattern thereon and methods for manufacturing semiconductor device In an automatic wafer process for gate array integrated circuits, it becomes necessary to identify the wafer every time at the beginning of each process. However, it is difficult for conventional methods to identify the wafer by detecting a bar code patte... | 04/25/1989 |
| 4812631 | Bar code and read-out method thereof A conventional bar code and a method of reading the same are so adapted that rays are irradiated on the bar code formed on a semiconductor wafer, and that reflected rays from the bar code are read out by a bar code reader to sense the bar code so that a m... | 03/14/1989 |
| 4585931 | Method for automatically identifying semiconductor wafers A technique for automatically identifying a semiconductor wafer (30) having bar code identification indicia (32) on the front surface (31) thereof. Reading of the code is achieved by rotating the wafer about an axis (34) perpendicular to its front surface... | 04/29/1986 |
| 4542528 | OCR and bar code reader with optimized sensor In an optical reader for reading alphanumeric and bar code characters, an area array for scanning alphanumeric data and a single photo sensor for scanning bar code data is formed on the same semiconductor chip. Separate processors are connected to the arr... | 09/17/1985 |
| 4523088 | Code bar for identification of series parts A code bar for the identification of series parts, for example vehicle bodies, within an assembly line, with several codings in the form of alternating bright and dark stripes of differing widths, corresponding respectively to the digits 0 through 9, cons... | 06/11/1985 |
| 4166574 | Apparatus for marking identification symbols on wafer An apparatus for marking identification symbols on a wafer including: a marking means for marking identification symbols on the wafer; a reading means for reading the marked identification symbols; a comparing means for comparing data of the identificatio... | 09/04/1979 |
