US3674904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for making fused quartz hollow slugs
Assignee: Amersil Inc
•
Filing: 1971-05-21
•
Granted: 1972-07-04
•
Expires: 1991-05-21
Abstract
Abstract A furnace for making fused quartz hollow slugs comprising a tubular housing containing an elongated electrical resistor heating means mounted coaxially in the housing with a quartz powder charge chamber intermediate the inner walls of the housing and the heating means, and a contained elastic tubular lining adjacent to and spaced from the inner walls, whereby the lining is hydrostatically motivated to compress a contained quartz powder charge in the charge chamber in the direction of the heating means.
Inventors
- 👤 Lothar Jung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:26
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/02; C03B5/033; C03B5/0334; C03B19/00; C03B19/09; F; F27; F27D; F27D11/00; F27D11/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A furnace for making fused quartz hollow slugs comprising a tubular housing having vacuum-tight closure means at both ends, an elongated electrical resistor heating means mounted coaxially in the housing, a charge chamber in the housiNg intermediate the tubular wall of the housing and the resistor heating means, an elastic tubular lining mounted in the housing adjacent to and spaced from the tubular wall of the housing, means for vacuumizing the space between the lining and the tubular wall, and means for hydrostatically motivating the lining in the direction of the electrical resistor heating means.
Claim 2
Dependent Claim
95 words
A furnace for making fused quartz hollow slugs comprising a tubular housing having vacuum-tight closure means at both ends, an elongated electrical resistor heating means mounted coaxially in the housing, a charge chamber in the housiNg intermediate the tubular wall of the housing and the resistor heating means, an elastic tubular lining mounted in the housing adjacent to and spaced from the tubular wall of the housing, means for vacuumizing the space between the lining and the tubular wall, and means for hydrostatically motivating the lining in the direction of the electrical resistor heating means.
Claim 3
Dependent Claim
25 words
A furnace for making fused quartz hollow slugs according to claim 1, comprising electrode means mounted at both ends of elongated electrical resistor heating means.
Claim 4
Dependent Claim
65 words
A furnace for making fused quartz hollow slugs according to claim 1, comprising an elongated quartz tube mounted in the housing with the resistor heating means being contained by the quartz tube coaxially thereof, opposite end portions of the quartz tube passing through the closure means in vacuum-tight relationship therewith, the inner space of the quartz tube being open to an atmosphere under suitable pressure.
Claim 5
Dependent Claim
25 words
A furnace for making fused quartz hollow slugs according to claim 1, comprising vacuum means communicating with the charge chamber for vacuumizing the charge chamber.
Claim 6
Dependent Claim
40 words
A furnace for making fused quartz hollow slugs according to claim 1, comprising an elongated quartz tube mounted in the housing with the resistor means being contained by the quartz tube, the quartz tube being completely contained within the housing.
Claim 7
Dependent Claim
32 words
A furnace for making fused quartz hollow slugs according to claim 2, wherein the electrodes are hollow electrodes having inner cavities, and means for admitting a coolant liquid into the inner cavities.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |