US4001104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cemented collector bar assemblies for aluminum cell carbon bottom block
Assignee: Graftech Technology LLC
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Filing: 1974-01-03
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Granted: 1977-01-04
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Expires: 1994-01-03
Abstract
Abstract A method for constructing a metallic collector bar-carbonaceous block assembly for the cathode bottom of an aluminum reduction cell comprising (a) positioning a metallic collector bar within a reduction cell on the bottom surface thereof so that the ends of the bar extend through the cell and connect to an external cathode bus system (b) depositing a layer of binder comprising an electrically conductive, carbonaceous cement onto the exposed surface of the bar, (c) positioning a prebaked carbonaceous cathode block having a transverse slot along its length, in the bottom surface thereof, astride the bar to firmly embed the bar within the slot, the slot having a width exceeding the width of the bar and a depth shallower than the height of the bar.
Inventors
- 👤 Jostein J. Vadla
- 👤 Robert G. Milner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:09
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
175 words
An improved method for constructing a conductive, metallic collector bar-carbonaceous block assembly in the cathode bottom of an aluminum reduction cell comprising the steps of: a. positioning a metallic collector bar within a reduction cell upon the bottom surface thereof, the ends of said bar protruding a predetermined distance through openings in oppositely situated side walls of said cell, and b. depositing a binder comprising a layer of an electrically conductive, carbonaceous and plastic cement onto the exposed surface of said bar, and c. positioning a prebaked carbonaceous cathode block having a transverse slot along its length, in the bottom surface thereof, astride said bar to firmly embed such bar within said slot, said slot having a width exceeding the width of said bar and a depth shallower than the height of said bar, said binder securing said bar to said block, the width of said cell measured between said side walls exceeding the length of said block by a distance insufficient to permit removal of said bar-block assembly as a unit from said cell.
Claim 2
Dependent Claim
175 words
An improved method for constructing a conductive, metallic collector bar-carbonaceous block assembly in the cathode bottom of an aluminum reduction cell comprising the steps of: a. positioning a metallic collector bar within a reduction cell upon the bottom surface thereof, the ends of said bar protruding a predetermined distance through openings in oppositely situated side walls of said cell, and b. depositing a binder comprising a layer of an electrically conductive, carbonaceous and plastic cement onto the exposed surface of said bar, and c. positioning a prebaked carbonaceous cathode block having a transverse slot along its length, in the bottom surface thereof, astride said bar to firmly embed such bar within said slot, said slot having a width exceeding the width of said bar and a depth shallower than the height of said bar, said binder securing said bar to said block, the width of said cell measured between said side walls exceeding the length of said block by a distance insufficient to permit removal of said bar-block assembly as a unit from said cell.
Claim 3
Dependent Claim
40 words
A method as defined in claim 1 wherein said metallic collector bar comprises a member selected from the group consisting of steel or iron and said carbonaceous block comprises a member selected from the group consisting of carbon or graphite.
Claim 4
Dependent Claim
15 words
A method as defined in claim 2 wherein said metallic collector bar is rectangularly shaped.
Claim 5
Dependent Claim
16 words
A method as defined in claim 2 wherein said distance is at least about 2 inches.
Claim 6
Dependent Claim
16 words
A method as defined in claim 2 wherein said bottom surface comprises a layer of insulation.
Claim 7
Dependent Claim
14 words
A method as defined in claim 5 wherein said layer of insulation comprises alumina.
Claim 8
Dependent Claim
15 words
A method as defined in claim 2 wherein said binder further comprises a metal powder.
Claim 9
Dependent Claim
24 words
A method as defined in claim 7 wherein said metal powder is a member selected from the group consisting of steel, copper and iron.
Claim 10
Dependent Claim
33 words
A method as defined in claim 2 wherein said slot extends wholly across a face of said block along a line defined by an imaginery division of said block into two equal parts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |