X-ray tube comprising an exit window
Patent 5367553 Issued on November 22, 1994. Estimated Expiration Date: 
November 22, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 22, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2679017 3517195 Multi-target X-ray tube Multitarget x-ray tube Patent #: 4870671 InventorsApplicationNo. 646954 filed on 01/25/1991US Classes:378/137, With electron scanning or deflecting means378/136With specific cathodeExaminersPrimary: Dzierzynski, Paul M.Assistant: Wong, Don Attorney, Agent or FirmForeign Patent References
International ClassH01J 035/00Foreign Application Priority Data1990-01-29 NLAbstractAn electron-optical system directs an electron beam which emanates, for example from a line-shaped or annular emissive cathode element, onto an anode target face in a collimated fashion so that a large part of reflected electrons is incident on the target face again, thus contributing to the generating of X-rays. The construction of the electron-optical system and the high degree of re-incidence of scattered electrons allows for a minimum distance between the anode target face and the exit window. A filament of the cathode may be constructed so as to achieve an optimally uniform operating temperature over a comparatively large part of its length.Other References
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