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US 4,750,926 AGranted
Method of making precision shaped apertures in glass
AssigneeCorning Glass Works
InventorGeorge E. Berkey
Life of this patent
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Abstract
Method of producing precision shaped apertures in glass is shown. A hollow glass member defining a longitudinal aperture is provided. A carbon graphite member is shaped externally to a desired shape, disposed within the longitudinal aperture in the glass member, which member is thereafter collapsed about the graphite member taking its shape and size. The graphite member is removed leaving the glass member with a precision aperture therein.
Claims11
A method of forming a shaped, hollow member comprising the steps of:
- providing a hollow glass member having a substantially circular elongated aperture along its longitudinal axis,
- providing a longitudinal carbon member having a predetermined desired cross-sectional shape,
- disposing said carbon member within said circular elongated aperture of said hollow glass member,
- heating the assembly so formed to the softening point of said glass member,
- placing the interior of said hollow glass member under vacuum,
- collapsing said glass member around said carbon member whereby the elongated interior aperture of said glass member assumes the shape of the exterior of said carbon member, and thereafter,
- removing said carbon member.
4 more elements
Dependencies are inferred from the claim text.