Patent US273237A successfully refreshed from Google Patents.
US4530378A
Expired / Lapsed
US
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Composite tubular body
Assignee: Heraeus Quarzschmelze GmbH
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Filing: 1982-07-30
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Granted: 1985-07-23
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Expires: 2002-07-30
Abstract
Abstract Tubular body of fused quartz and quartz glass with a seamless transition from the fused-quartz zone to the quartz-glass zone. The body is manufactured continuously in a hollow rotating metal cylinder by disposing silica against the rotating mold and adding thereto, such as in an annular zone therein, rock crystal or synthetic silicon dioxide and fusing the rock crystal or synthetic silicon dioxide to the fused silica whereby no seam is formed.
Inventors
- 👤 Manfred Boog
- 👤 Werner Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:28
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/09; C03B19/095; C03B20/00; Y; Y10; Y10S; Y10S285/00; Y10S285/911; Y10S65/00; Y10S65/08; Y10S65/09; Y10T; Y10T428/00; Y10T428/13; Y10T428/131
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
A composite tubular body with at least one open end, comprising at least one annular zone of fused quartz and at least of one annular zone of quartz glass, said fused quartz produced essentially from quartz sand and said quartz glass from rock crystal or synthetic silicon dioxide, at least one of said annular zones of fused quartz fused at its end to one end of said annular zone of quartz glass to define a transition zone therebetween having a length of at least 10 mm and a diameter of at least 150 mm.
Claim 2
Dependent Claim
94 words
A composite tubular body with at least one open end, comprising at least one annular zone of fused quartz and at least of one annular zone of quartz glass, said fused quartz produced essentially from quartz sand and said quartz glass from rock crystal or synthetic silicon dioxide, at least one of said annular zones of fused quartz fused at its end to one end of said annular zone of quartz glass to define a transition zone therebetween having a length of at least 10 mm and a diameter of at least 150 mm.
Claim 3
Dependent Claim
23 words
A composite tubular body according to claim 1, wherein at least one end zone of the composite body is manufactured of quartz glass.
Claim 4
Dependent Claim
16 words
A composite tubular body according to claim 1, wherein at least one free end is flanged.
Claim 5
Dependent Claim
28 words
A composite tubular body according to claim 1, wherein the outside diameter of said body is more than 300 mm and its walls 10 to 25 mm thick.
Claim 6
Dependent Claim
37 words
A composite tubular body according to claim 1, wherein said transition zone is of a composition resulting from the fusing of the compositions of said annular zone of fused quartz and said annular zone of quartz glass.
Claim 7
Dependent Claim
17 words
A composite tubular body according to claim 1, wherein said tubular body is open at both ends.
Claim 8
Dependent Claim
17 words
A composite tubular body according to claim 1, wherein said tubular body is closed at one end.
Claim 9
Dependent Claim
22 words
A composite tubular body according to claim 1, wherein along the inside wall of said transition zone there is a glazed coating.
Claim 10
Dependent Claim
26 words
A composite tubular body according to claim 8, wherein said glazed coating overlies said annular zone of fused quartz and said annular zone of quartz glass.
Claim 11
Dependent Claim
28 words
A composite tubular body according to claim 1, wherein the annular zone of said fused quartz is fused to the annular zone of quartz glass without a bead.
Claim 12
Dependent Claim
34 words
A composite tubular body according to claim 1, wherein there is no bead at the point where said annular zone of fused quartz abuts and is fused to said annular zone of quartz glass.
Claim 13
Dependent Claim
25 words
A composite tubular body according to claim 1, wherein said transition zone has a length of at least 10 mm and up to 50 mm.
Claim 14
Dependent Claim
20 words
A composite tubular body according to claim 12, wherein said transition zone has a length of 30 to 50 mm.
Claim 15
Dependent Claim
19 words
A composite tubular body according to claim 1, wherein the diameter of the tube is less than 700 mm.
Claim 16
Dependent Claim
41 words
A composite tubular body according to claim 1, wherein there is a glazed coating of a thickness of at least 2 mm overlying the annular zone of fused quartz, the annular zone of quartz glass and the transition zone disposed therebetween.
References Cited (Backward Citations)
GB330943A
Cited
US2149133A
Cited
US3362435A
Cited
US3544281A
Cited
US3927697A
Cited
US3882901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |