US4058668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold crucible
Assignee: United States Department of the Interior
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Filing: 1976-03-01
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Granted: 1977-11-15
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Expires: 1996-03-01
Abstract
Abstract The side wall of a right-cylindrical crucible is formed by pairs of concentric tubes, one the outer and one the inner. Open upper ends of the inner tubes are spaced below closed upper ends of outer tubes, and a cooling water circuit serially through the inner and outer tubes is established by manifolds.
Inventors
- 👤 Philip G. Clites
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:52
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/06; F27B14/061; F27B14/063; F27D; F27D9/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A cold crucible having a normally vertical side wall formed of a plurality of vertical concentric tube pairs disposed side-by-side, each tube pair being comprised of an outer tube having a closed upper end and an open lower end and an inner tube spaced inwardly from the outer tube and having open upper and lower ends, plural header means respectively connected to the lower ends of each of the tubes in the pairs, and means for connecting water supply and return conduits to the respective header means.
Claim 2
Dependent Claim
87 words
A cold crucible having a normally vertical side wall formed of a plurality of vertical concentric tube pairs disposed side-by-side, each tube pair being comprised of an outer tube having a closed upper end and an open lower end and an inner tube spaced inwardly from the outer tube and having open upper and lower ends, plural header means respectively connected to the lower ends of each of the tubes in the pairs, and means for connecting water supply and return conduits to the respective header means.
Claim 3
Dependent Claim
43 words
A cold crucible as defined in claim 1, said side wall being of closed configuration as seen in plan view, and having a bottom constituted by a partition which is common to the interior of the crucible and one of said header means.
Claim 4
Dependent Claim
24 words
A cold crucible as defined in claim 2, said crucible being of right-cylindrical form, said side wall being circular as seen in plan view.
Claim 5
Dependent Claim
22 words
A cold crucible as defined in claim 3, said outer tubes being substantially D-shape with substantially flat sides thereof facing radially inward.
Claim 6
Dependent Claim
34 words
A cold crucible as defined in claim 1, said side wall being circular as seen in plan view, said outer tubes being substantially D-shape with substantially flat sides thereof facing inwardly of the circle.
References Cited (Backward Citations)
US3520980A
Cited
US3461215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |