Abstract: An x-ray machine, such as a mammography machine, comprises a source of a narrow beam of radiation which scans across an object, e.g., a breast, to be imaged. A sensor for the narrow beam moves in the same direction as the narrow beam. The sensor generates an output signal which indicates the position of the beam relative to a specific location on the sensor. A control circuit receives the signal from the sensor and outputs a control signal to regulate the position of the beam relative to the sensor.

Abstract: An x-ray machine, such as a mammography machine, comprises a source of a narrow beam of radiation which scans across an object, e.g., a breast, to be imaged. A sensor for the narrow beam moves in the same direction as the narrow beam. The sensor generates an output signal which indicates the position of the beam relative to a specific location on the sensor. A control circuit receives the signal from the sensor and outputs a control signal to regulate the position of the beam relative to the sensor.

Abstract: A security document with a design (e.g. a generally oval seal) is constructed in such a way that the design is full value halftone, such as produced from juxtaposed line screens having a frequency between 100-133 lines per inch. Negative and positive masks having an image (e.g. arabic numeral, letter, or other symbol), are used with the screens to produce a printing plate. A document is printed with the printing plate in a conventional lithographic process, and there is an overprinting on the design (at least that portion having the image) with a white opaque ink or overprint varnish to produce an image. The image is not readily visible to the naked human eye when viewed generally perpendicular to the plane of the document, but is readily visible by the naked human eye when the document is tilted so that it is viewed distinctly non-perpendicular to the plane of the document.

Abstract: An automatic exposure control system which regulates the power supplied to an x-ray source of a tomographic apparatus is disclosed. The system includes an x-ray source movably opposing an ionization chamber with a sweeping mechanism and a control for controlling the mechanism. A microprocessor which receives an input reference voltage and combines the voltage with a signal generated by the control to thereby produce a reference signal. This reference signal is then compared with a signal detected by the ionization chamber to determine an output error signal. Power supplied to the x-ray source is then adjusted based on this error signal.

Abstract: Tickets for concerts, conventions, sports, and like events, have a security feature to assist in preventing counterfeiting. A stretchable security thread is disposed in a piece of paper stock extending so that it intersects, with portions lying on either side of, a line of separation in the piece of paper stock (and/or is parallel to the length of the ticket). The line of separation typically is a perforation. The security thread is a stretchable material, such as polyester, and may have microprinting. When the ticket is detached at the line of separation, the security thread does not initially separate but rather stretches to provide a visual (and tactile) indication between the separated portions of the paper stock before it breaks. Such tickets are produced from a web of material having the security threads, which web is printed, and then cut into sheets for delivery to a customer who then can apply variable printing.

Abstract: A cut sheet mailer business form assembly comprises a non-adhesive bearing message sheet and one or more adhesive-bearing cover sheets prepared for printing of the message sheet, alignment and sealing to provide multiple mailers.A rectangular message sheet has end edges, marginal edges, a longitudinal dimension between the end edges along a longitudinal axis, and a transverse dimension between the marginal edges along a transverse axis. Marginal lines of perforations are along the marginal edges of the message sheet extending fully between the end edges. Transverse end lines of perforations extend along the end edges between the marginal lines of perforations. A rectangular cover sheet has cover sheet end edges, cover sheet marginal edges, a longitudinal dimension between the cover sheet end edges equal to the longitudinal dimension of the message sheet, and a transverse dimension between the cover sheet marginal edges equal to the transverse dimension of the message sheet.

Abstract: A mammography system with a variable angle, rearwardly tilting mammograph adjustable to individual, standing or sitting patients in forwardly leaning posture to maximize breast tissue exposure to the mammograph by gravity. The invention covers both the mammograph machine and the mammography method.

Abstract: Tickets for concerts, conventions, sports, and like events, have a security feature to assist in preventing counterfeiting. A stretchable security thread is disposed in a piece of paper stock extending so that it intersects, with portions lying on either side of, a line of separation in the piece of paper stock (and/or is parallel to the length of the ticket). The line of separation typically is a perforation. The security thread is a stretchable material, such as polyester, and may have microprinting. When the ticket is detached at the line of separation, the security thread does not initially separate but rather stretches to provide a visual (and tactile) indication between the separated portions of the paper stock before it breaks. Such tickets are produced from a web of material having the security threads, which web is printed, and then cut into sheets for delivery to a customer who then can apply variable printing.

Abstract: An x-ray machine in which an electronic network automatically sets the KV for the power to the x-ray tube, by using a transformer with separate secondary windings which can be selectively included in a series circuit through relays controlled by a binary sequence, in response to operator-selected KV control signal, in a system in which the operator selects the mAs setting and the other technic factors (except KV) are automatically selected.