Patent US4534935A successfully refreshed from Google Patents.
US4534935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing of titanium anode substrates
Assignee: Vale Canada Ltd
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Filing: 1984-01-09
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Granted: 1985-08-13
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Expires: 2004-01-09
Abstract
Abstract Sponge titanium powder is compacted, advantageously by roll compaction to a density in the range of about 60% to 80% of the density of solid titanium metal, thereafter heat treated in vacuum at about 500 DEG C. to 750 DEG C., cooled in vacuum to 300 DEG C. and quenched to 100 DEG C. to provide a substrate for electrodes useful in electrolytic processes.
Inventors
- 👤 John Ambrose
- 👤 Douglas K. Charles
- 👤 Bruce R. Conard
- 👤 Carlos Diaz
- 👤 Charles E. O'Neill
- 👤 Wayne P. Leavoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:28
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/055; C25B11/057; B; B22; B22F; B22F3/00; B22F3/10; B22F3/1017; B22F3/1028; B22F3/11; C25B11/061; C25B11/063; B22F2201/00; B22F2201/10; B22F2201/20; B22F2998/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A process for producing electrode substrate comprising compacting sponge titanium powder to an appropriate form having a density of about 60% to about 80% of titanium metal, thereafter heat treating the thus compacted powder form at a temperature of about 500° to about 750° C. for at least one hour under conditions so as to avoid the formation of non-elemental species of titanium and cooling the thus compacted and heat treated form under conditions so as to avoid the formation of non-elemental species of titanium to a temperature of about 100° C., to thereby provide an electrode substrate having physical and mechanical properties and characteristics amenable to commercial use as an electrode including inherently low electrical resistivity that enables satisfactory current distribution over the complete surface of the electrode.
Claim 2
Dependent Claim
129 words
A process for producing electrode substrate comprising compacting sponge titanium powder to an appropriate form having a density of about 60% to about 80% of titanium metal, thereafter heat treating the thus compacted powder form at a temperature of about 500° to about 750° C. for at least one hour under conditions so as to avoid the formation of non-elemental species of titanium and cooling the thus compacted and heat treated form under conditions so as to avoid the formation of non-elemental species of titanium to a temperature of about 100° C., to thereby provide an electrode substrate having physical and mechanical properties and characteristics amenable to commercial use as an electrode including inherently low electrical resistivity that enables satisfactory current distribution over the complete surface of the electrode.
Claim 3
Dependent Claim
30 words
A process as in claim 1 wherein the sponge titanium powder has an average particle size of 50 to 150 μm and is compacted by rolling into a sheet form.
Claim 4
Dependent Claim
12 words
A process as in claim 1 wherein compaction is carried out isostatically.
Claim 5
Dependent Claim
14 words
A process as in claim 1 wherein the produced substrate form is a rod.
Claim 6
Dependent Claim
15 words
A process as in claim 2 wherein the rolling operation is conducted using multiple passes.
Claim 7
Dependent Claim
14 words
A process as in claim 2 wherein the heat treatment is conducted in vacuum.
Claim 8
Dependent Claim
26 words
A process as in claim 6 wherein, after heat treatment, the thus heat treated product is cooled in vacuum to a temperature of about 300° C.
Claim 9
Dependent Claim
22 words
A process as in claim 7 wherein the thus heat treated product is finally cooled to about 100° C. in inert gas.
Claim 10
Dependent Claim
29 words
A process as in claim 6 wherein the heat treatment is carried out at a temperature in the range of 500° C. to 750° C. for about two hours.
References Cited (Backward Citations)
US3496036A
Cited
US3729971A
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US4029566A
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US4078988A
Cited
US4179289A
Cited
GB2076859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |