US3634056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quartz-to-metal seal manufacture
Assignee: General Electric Co
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Filing: 1969-11-13
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Granted: 1972-01-11
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Expires: 1989-11-13
Abstract
Abstract An assembly is formed of an outer tubular silica member having therein an inner tubular silica member which has an open end fused to the inner wall of the outer member and a closed end in the form of a reentrant dimple having a thinned-out annular area of weakness in its sidewalls, a thin-walled molybdenum cup is inserted over the inner member into the annular space between said outer and inner members, the walls of said outer and inner members are fused to embed and hermetically seal the walls of the cup therebetween, and the closed end of the dimple is tapped with a small rod inserted through a hole in the closed end of the cup to break out the end of the dimple at its thin sidewalls.
Inventors
- 👤 Gene I Thomasson
- 👤 Edward V Parillo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02; H; H01; H01K; H01K3/00; H01K3/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
The method of claim 1 wherein the inner tubular silica member is prepared by heating to a plastic condition a closed end of a silica tube, thrusting along the axis of said tube and against the said plastic closed end thereof the forward end of a reduced diameter nose portion of a vacuum chuck to thereby form the reentrant dimple portion with thinned out sidewalls, and using the said vacuum chuck to hold the said inner tubular silica member at a desired location within and concentric with the outer tubular silica member while fusing the open end of tHe inner tubular member to the inner wall of the outer member.
Claim 2
Dependent Claim
92 words
The method of claim 2 wherein, during the fusing of the walls of said inner and outer tubular silica members to form a hermetic seal with the walls of said cup, the interior of that end of the outer tubular silica member which contains the said cup is under a vacuum while the other end of the outer tubular silica member is under pressure so that the fused walls of said inner and outer tubular silica members are compressed against the respective inner and outer surfaces of the walls of said cup.
Claim 3
Dependent Claim
92 words
The method of claim 1 wherein, during the fusing of the walls of said inner and outer tubular silica members to form a hermetic seal with the walls of said cup, the interior of that end of the outer tubular silica member which contains the said cup is under a vacuum while the other end of the outer tubular silica member is under pressure so that the fused walls of said inner and outer tubular silica members are compressed against the respective inner and outer surfaces of the walls of said cup.
References Cited (Backward Citations)
US2659964A
Cited
US3320352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |