US3652245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for making fused quartz hollow slugs
Assignee: Amersil Inc
•
Filing: 1970-09-22
•
Granted: 1972-03-28
•
Expires: 1990-09-22
Abstract
Abstract A furnace for making fused quartz hollow slugs comprising a cylindrical tubular housing having closure means at both ends, a quartz tube mounted coaxially in the housing in spaced relationship with the housing, the tube passing through the closure means in vacuum-tight relationship therewith and forming an annular charge chamber between the quartz tube and the wall of the housing, an elongated electrical resistor heating means mounted in the quartz tube in spaced relationship and coaxially of the quartz tube, the inner space of the quartz tube being open to either atmospheric air pressure or to an atmosphere of controlled pressure and chemical composition suitably applied, and vacuum means communicating with the charge chamber for vacuumizing the charge chamber.
Inventors
- 👤 Lothar Jung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:52
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/09; C03B5/00; C03B5/02; C03B5/033; C03B5/0334; Y; Y10; Y10S; Y10S65/00; Y10S65/04; Y10S65/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A furnace for making fused quartz hollow slugs comprising a cylindrical tubular-walled housing having vacuum-tight closure means sealing both ends of the housing, a fused quartz tube mounted in the housing coaxially of and in spaced relationship with the housing, end portions of the fused quartz tube passing through the closure means in vacuum-tight relationship therewith, an annular charge chamber between the fused quartz tube and the wall of the housing, an elongated electrical resistor heating means mounted in the fused quartz tube in spaced relationship therewith and coaxially thereof, the fused quartz tube being open at the ends thereof to an external atmosphere, and a vacuum conduit communicating with the charge chamber through an aperture through the housing wall.
Claim 2
Dependent Claim
120 words
A furnace for making fused quartz hollow slugs comprising a cylindrical tubular-walled housing having vacuum-tight closure means sealing both ends of the housing, a fused quartz tube mounted in the housing coaxially of and in spaced relationship with the housing, end portions of the fused quartz tube passing through the closure means in vacuum-tight relationship therewith, an annular charge chamber between the fused quartz tube and the wall of the housing, an elongated electrical resistor heating means mounted in the fused quartz tube in spaced relationship therewith and coaxially thereof, the fused quartz tube being open at the ends thereof to an external atmosphere, and a vacuum conduit communicating with the charge chamber through an aperture through the housing wall.
Claim 3
Dependent Claim
18 words
A furnace according to claim 1, comprising electrode means connected to both ends of the elongated reisitor means.
Claim 4
Dependent Claim
31 words
A furnace according to claim 1, comprising flanges at both ends of the cylindrical housing, a jacket means positioned between the flanges and spaced from the outer wall of the housing.
Claim 5
Dependent Claim
49 words
A furnace according to claim 1, comprising a pair of quartz flanges mounted on the quartz tube, each flange being spaced from one end of the tube sufficiently to enable it to be contained by the housing and providing a chamber between each flange and each housing closure means.
Claim 6
Dependent Claim
26 words
A furnace according to claim 1, comprising a porous cylindrical sleeve inside of and coaxial of the housing adjacent the inner surface of the housing wall.
Claim 7
Dependent Claim
13 words
A furnace according to claim 5, wherein the sleeve is a metal screen.
Claim 8
Dependent Claim
14 words
A furnace according to claim 5, wherein the sleeve is composed of powdeR particles.
Claim 9
Dependent Claim
32 words
A furnace according to claim 1, comprising flanges at both ends of the cylindrical housing, said closure means being plate members each clamped onto one of the flanges in vacuum-tight relationship therewith.
Claim 10
Dependent Claim
24 words
A furnace according to claim 1, wherein the resistor means is composed of a material selected from the group consisting of carbon and graphite.
References Cited (Backward Citations)
US1068716A
Cited
US1232785A
Cited
US2027155A
Cited
US2930098A
Cited
US3261676A
Cited
US3404973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |