The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 1990
Filed:
Aug. 30, 1989
John R Hale, East Hempfield Twp, Lancaster County, PA (US);
Earl R Stahl, Mount Joy, PA (US);
Jack H Davis, East Hempfield Twp., Lancaster County, PA (US);
Gregory C Madensky, Clarks Summit, PA (US);
RCA Licensing Corporation, Princeton, NJ (US);
Abstract
The heating unit for sealing vacuum electron tubes of the type having a glass stem, a glass exhaust tubulation extending from the stem and a plurality of electrically-conducting leads extending from the stem in a circular array around the tabulation includes a cylindrical heating coil within a coil recess of an electrically-insulating coil support. The coil recess circumscribes a central aperture within the coil support. The coil support has a first and a second surface with a coil-positioning lip projecting upwardly from the second surface thereof and circumscribing the central aperture. A hollow, substantially cylindrical, tubulation-locator having an outwardly extending flange formed in an outside surface thereof is disposed between the second surface of the coil support and a base plate. The locator also includes a centering collar formed in its outside surface and a tubulation centering aperture formed in the inside surface. A top plate is adjacent to the first surface of the coil support. The top plate has an aperture with a diameter greater than the diameter of the circular array of leads extending from the glass stem. A coil centering annular coil guide is formed in the top plate. A stem support disposed on the top plate includes a plurality of stem-contacting members which support the stem and establish the longitudinal position of the tubulation within the heating coil.