Patent US3014632A successfully refreshed from Google Patents.
Patent US3897223A successfully refreshed from Google Patents.
US3897223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nb joined to alumina with Ni-Ti eutectic seal
Assignee: Intermedics Inc
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Filing: 1974-10-17
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Granted: 1975-07-29
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Expires: 1994-10-17
Abstract
Abstract The method of joining members 23 and 21 (FIG. 1) of copper and tungsten and members 33 and 31 (FIG. 2) of copper and corrosion and/or temperature-resistant nickel-base alloys in the practice of which a mass 25 (FIG. 1) of titanium is interposed between the members and the joint is heated to produce a eutectic of copper and titanium and then permitted to solidify. The like method for joining members 53 and 56 (FIG. 6) of niobium and aluminium oxide in which a mass of nickel and titanium or of titanium alone are interposed between the members. Brazed assemblies produced by the methods. A high-temperature resistant vacuum seal of niobium and aluminium oxide.
Inventors
- 👤 David L Purdy
- 👤 John F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:38
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3033; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/403; C04B2237/407; C04B2237/50; C04B2237/70; C04B2237/706; C04B2237/72; C04B2237/76; C04B2237/765; C04B2237/84; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12778
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
A VACUUM-TIGHT ASSEMBLY CONSISTING ESSENTIALLY OF A MEMBER OF ALUMINUM OXIDE AND A MEMBER OF NIOBIUM, A MASS CONSISTING ESSENTIALLY OF NICKEL AND TITANIUM IN EUTECTIC PROPORTIONS MELTING AT ABOUT 1,125*C. CONTIGUOUS TO AND BONDED TO SAID MEMBERS, THE ALUMINUM OXIDE AND NIOBIUM MEMBER HAVING THERMAL COEFFICIENTS OF EXPANSION WHICH CLOSELY MATCH OVER A WIDE RANGE OF TEMPERATURES, WHEREBY A VACUUM-TIGHT ASSEMBLY IS MAINTAINED AT THE HIGH TEMPERATURE AT WHICH GENERATORS HAVING A RADIOACTIVE HEAT SOURCE OPERATE.
Claim 2
Dependent Claim
77 words
A VACUUM-TIGHT ASSEMBLY CONSISTING ESSENTIALLY OF A MEMBER OF ALUMINUM OXIDE AND A MEMBER OF NIOBIUM, A MASS CONSISTING ESSENTIALLY OF NICKEL AND TITANIUM IN EUTECTIC PROPORTIONS MELTING AT ABOUT 1,125*C. CONTIGUOUS TO AND BONDED TO SAID MEMBERS, THE ALUMINUM OXIDE AND NIOBIUM MEMBER HAVING THERMAL COEFFICIENTS OF EXPANSION WHICH CLOSELY MATCH OVER A WIDE RANGE OF TEMPERATURES, WHEREBY A VACUUM-TIGHT ASSEMBLY IS MAINTAINED AT THE HIGH TEMPERATURE AT WHICH GENERATORS HAVING A RADIOACTIVE HEAT SOURCE OPERATE.
Claim 3
Dependent Claim
81 words
A brazed vacuum-tight assembly consisting essentially of an aluminum oxide member and a member of niobium sealed together by a thin mass consisting essentially of nickel and titanium, the proportions of nickel and titanium corresponding generally to the 66.2% nickel eutectic, the aluminum oxide member and niobium member having thermal coefficients of expansion which closely match over a wide range of temperatures, whereby a vacuum-tight assembly is maintained at the high temperature at which generators having a radioactive heat source operate.
Claim 4
Dependent Claim
81 words
A brazed vacuum-tight assembly consisting essentially of an aluminum oxide member and a member of niobium sealed together by a thin mass consisting essentially of nickel and titanium, the proportions of nickel and titanium corresponding generally to the 66.2% nickel eutectic, the aluminum oxide member and niobium member having thermal coefficients of expansion which closely match over a wide range of temperatures, whereby a vacuum-tight assembly is maintained at the high temperature at which generators having a radioactive heat source operate.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |