Patent US1419619A successfully refreshed from Google Patents.
Patent US3616440A successfully refreshed from Google Patents.
US3616440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for servicing alumina reduction cells
Assignee: Harvey Aluminum Inc
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Filing: 1968-04-23
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Granted: 1971-10-26
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Expires: 1988-04-23
Abstract
Abstract A vehicle suitable for use in servicing alumina reduction cells, said vehicle having mounted thereon a power operated crustbreaking device and an alumina storage and handling system, the crust-breaking device comprising a head mounted on an extensible arm which is vertically and horizontally actuatable by hydraulic means, sufficient downward force being exerted by the hydraulic means to cause penetration of the head through the electrolyte crust, the alumina content of the cell being replenished by introduction of alumina into the cell from an alumina storage bin on the vehicle.
Inventors
- 👤 Helge O Forberg
- 👤 Lloyd H Mckay
- 👤 Leland B Gonderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:45
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
16 words
The vehicle as defined by claim 1, wherein the crust-breaking head is circular in cross section.
Claim 2
Dependent Claim
20 words
The vehicle as defined by claim 1, wherein a plurality of projections extend from the periphery of the crust-breaking head.
Claim 3
Dependent Claim
17 words
The vehicle as defined by claim 1, wherein the crust-breaking head is rotatably mounted on the arm.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |