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US4414281A Expired / Lapsed US ⏱️ 0.0 years remaining

Glass-ceramic articles having metallic surfaces

Assignee: Corning Glass Works
•
Filing: 1982-02-16
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Granted: 1983-11-08
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Expires: 2002-02-16
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Abstract

Abstract This invention is directed to the production of composite articles composed of a substrate consisting of a machinable glass-ceramic and an integral, electrically-conductive surface layer consisting of metallic copper and/or silver. The inventive articles are prepared by heat treating precursor glass bodies containing copper and/or silver ions to grow fluormica crystals therein, thereby producing glass-ceramics, and to cause migration of the copper and/or silver ions to the surface thereof which are reduced to metallic copper and/or silver via heat treating in a reducing atmosphere. Where desired, holes can be bored, drilled, or punched into the glass-ceramic prior to exposure to the reducing heat treatment such that, upon heat treatment in a reducing environment, the sides of the holes will become metal plated.

Inventors

  • 👤 Syed N. Hoda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 22:57
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/16; C03C23/00; H; H05; H05K; H05K3/00; H05K3/10; H05K3/105

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 112 words
A composite article composed of a substrate consisting of a glass-ceramic, wherein the predominant crystal phase is a synthetic fluormica selected from the group of normal fluorophlogopite, alkali metal boron fluorophlogopite, and alkaline earth metal fluorophlogopite, which is mechanically machinable and an integral, electrically-conductive surface layer consisting of metallic copper and/or silver, said glass-ceramic consisting essentially, expressed in terms of weight percent on the oxide basis, of about 6-22% MgO, 10-18% MgF, an effective amount up to 6% Cu 2 O and/or Ag 2 O, 0-14% K 2 0, 0-16% BaO, 0-12% SrO, 0-10% CaO, 0-22% Al 2 O 3 , 0-18% B 2 O 3 , and 30-47% SiO 2 .
Claim 2
Dependent Claim 112 words
A composite article composed of a substrate consisting of a glass-ceramic, wherein the predominant crystal phase is a synthetic fluormica selected from the group of normal fluorophlogopite, alkali metal boron fluorophlogopite, and alkaline earth metal fluorophlogopite, which is mechanically machinable and an integral, electrically-conductive surface layer consisting of metallic copper and/or silver, said glass-ceramic consisting essentially, expressed in terms of weight percent on the oxide basis, of about 6-22% MgO, 10-18% MgF, an effective amount up to 6% Cu 2 O and/or Ag 2 O, 0-14% K 2 0, 0-16% BaO, 0-12% SrO, 0-10% CaO, 0-22% Al 2 O 3 , 0-18% B 2 O 3 , and 30-47% SiO 2 .
Claim 3
Dependent Claim 33 words
A composite article according to claim 1 wherein the predominant crystal phase present in sald glass-ceramic substrate is an alkaline earth metal fluorophlogopite and said glass-ceramic is essentially free from alkali metal oxide.

References Cited (Backward Citations)

US3464806A Cited
US3420645A Cited
US3802892A Cited
US3756838A Cited
US3892904A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-11-07 1987-05-09 1987-11-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-11-07 1991-05-09 1991-11-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-11-07 1995-05-09 1995-11-08 $7700.00 Window Closed / Lapsed

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