Patent US4559280A successfully refreshed from Google Patents.
US4559280A
Expired / Lapsed
US
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Metallized rare earth garnet and metal seal to same
Assignee: Philips North America LLC
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Filing: 1984-12-18
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Granted: 1985-12-17
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Expires: 2004-12-18
Abstract
Abstract A reliable garnet to metal hermetic seal is obtained by metallizing the garnet with successive sputtered layers of tantalum or titanium, molybdenum or tungsten and nickel, followed by soldering or brazing the metallized garnet to a metal member.
Inventors
- 👤 Robert L. Bronnes
- 👤 James K. McKinlay
- 👤 Richard C. Sweet
- 👤 Walter K. Zwicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/123; C04B2237/125; C04B2237/126; C04B2237/127; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/50; C04B2237/70; C04B2237/708; C04B2237/72; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12736; Y10T428/12743; Y10T428/1275
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A garnet-to-metal seal comprising: a garnet body having a surface at least partially metallized by a first sputter deposited layer of a reactive metal, a second sputter deposited layer of a refractory metal, and a third sputter deposited layer of a solderable layer; a metal member to be bonded; and a solder layer between the third sputter layer and the metal member.
Claim 2
Dependent Claim
62 words
A garnet-to-metal seal comprising: a garnet body having a surface at least partially metallized by a first sputter deposited layer of a reactive metal, a second sputter deposited layer of a refractory metal, and a third sputter deposited layer of a solderable layer; a metal member to be bonded; and a solder layer between the third sputter layer and the metal member.
Claim 3
Dependent Claim
26 words
The seal of claim 1 in which the reactive metal is selected from the group consisting of tantalum, titanium, vanadium, hafnium, zirconium, niobium and alloys thereof.
Claim 4
Dependent Claim
20 words
The seal of claim 1 in which the refractory metal is selected from the group consisting of molybdenum and tungsten.
Claim 5
Dependent Claim
12 words
The seal of claim 1 in which the solderable metal is nickel.
Claim 6
Dependent Claim
31 words
The seal of claim 1 in which the reactive metal is selected from the group consisting of tantalum and titanium, the refractory metal is molybdenum and the solderable metal is nickel.
Claim 7
Dependent Claim
29 words
The seal of claim 5 in which the first layer is about one-half micron in thickness and the second and third layers are each about one micron in thickness.
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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |