US3773643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace structure
Assignee: Alcoa Corp
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Filing: 1971-09-16
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Granted: 1973-11-20
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Expires: 1991-09-16
Abstract
Abstract Furnace having a chamber for holding molten salt, such as alkali metal chloride and alkaline earth metal chloride, in which contact of the molten salts with a perimetric shell around that chamber is prevented by a glass barrier between that shell and the aforesaid chamber.
Inventors
- 👤 A Russell
- 👤 L Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:30
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/085
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
A furnace in accordance with claim 1, which includes a layer of insulation between the said glass barrier and the said wall, the said insulation layer being permeable by the said bath.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |