US3929426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of anchoring metallic coated leads to ceramic bodies and lead-ceramic bodies formed thereby
Assignee: RCA Corp
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Filing: 1974-05-08
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Granted: 1975-12-30
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Expires: 1994-05-08
Abstract
Abstract Mechanical retension of a lead having a core material with a ductile metal plating of lower melting temperature is provided within a receiving opening of a fired ceramic body by heating the lead within the opening of the ceramic body to a temperature between the melting temperature of the plating on the lead and the melting temperature of the core material of the lead. A charge of molten plating material is formed and cast thereby, substantially by capillary action, within an interstitial opening at the lead-ceramic interface substantially conterminous to surfaces of interior surface irregularities within the opening. Upon cooling, an integral lead-ceramic body is formed wherein the lead is anchored within its receiving opening substantially by the casting of the plating material within the surface irregularities.
Inventors
- 👤 Henry Leo Blust
- 👤 Norman Lee Lindburg
- 👤 Dale Vernon Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:20
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/124; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/70; C04B2237/704; C04B2237/76; C04B2237/84; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12472; Y10T428/12493; Y10T428/12535; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/12917; Y10T428/12924
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
AN INTEGRAL CERAMIC-LEAD BODY COMPRISING: A. A FIRED CERAMIC BODY; B. AN OPENING WITHIN SAID BODY HAVING AN INTERIOR SURFACE WITH IRREGULARITIES; C. A LEAD ANCHORED WITHIN SAID OPENING, SAID LEAD INCLUDING A CORE MATERIAL OF A FIRST METALLIC COMPOSITION AND A PLATED SURFACE OF A SECOND METALLIC COMPOSITION, THE MELTING TEMPERATURE OF WHICH IS LOWER THAN THAT OF SAID FIRST METALLIC COMPOSITION; SAID FIRST METALLIC COMPOSITION BEING WETTABLE BY SAID SECOND METALLIC COMPOSITION; SAID INTERIOR SURFACE BEING SUBSTANTIALLY NON-WETTABLE BY SAID SECOND METALLIC COMPOSITION; AND D. MEANS FOR MECHANICAL RETENTION OF SAID LEAD WITHIN SAID OPENING COMPRISING PRIMARILY A CASTING OF SAID SECOND METALLIC COMPOSITION WITHIN SAID IRREGULARITIES OF SAID INTERIOR SURFACE.
Claim 2
Dependent Claim
113 words
AN INTEGRAL CERAMIC-LEAD BODY COMPRISING: A. A FIRED CERAMIC BODY; B. AN OPENING WITHIN SAID BODY HAVING AN INTERIOR SURFACE WITH IRREGULARITIES; C. A LEAD ANCHORED WITHIN SAID OPENING, SAID LEAD INCLUDING A CORE MATERIAL OF A FIRST METALLIC COMPOSITION AND A PLATED SURFACE OF A SECOND METALLIC COMPOSITION, THE MELTING TEMPERATURE OF WHICH IS LOWER THAN THAT OF SAID FIRST METALLIC COMPOSITION; SAID FIRST METALLIC COMPOSITION BEING WETTABLE BY SAID SECOND METALLIC COMPOSITION; SAID INTERIOR SURFACE BEING SUBSTANTIALLY NON-WETTABLE BY SAID SECOND METALLIC COMPOSITION; AND D. MEANS FOR MECHANICAL RETENTION OF SAID LEAD WITHIN SAID OPENING COMPRISING PRIMARILY A CASTING OF SAID SECOND METALLIC COMPOSITION WITHIN SAID IRREGULARITIES OF SAID INTERIOR SURFACE.
Claim 3
Dependent Claim
74 words
a ceramic-lead body in accordance with claim 1, wherein said second metallic composition comprises material having ductile properties effective to permit deformation of said material cast within said irregularities at tempertures below its melting temperature, said material deformation substantially compensating for thermally caused differential expansion between said core material and said ceramic body whereby a surface portion of said second metallic material is maintained substantially conterminous with the interior surface irregularities of said opening.
Claim 4
Dependent Claim
23 words
A ceramic-lead body in accordance with claim 2, wherein said lead includes a core material of steel, and a plated surface of copper.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |