US4891066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly pure titanium
Assignee: Toshiba Corp
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Filing: 1988-07-15
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Granted: 1990-01-02
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Expires: 2008-07-15
Abstract
Abstract Disclosed is a highly pure titanium which comprises containing not more than 200 ppm of oxygen; not more than 30 ppm each of elements consisting of iron, nickel and chromium, and not more than 0.1 ppm each of elements consisting of sodium and potassium. Disclosed is also a process for preparing the above highly pure titanium which comprises melting a crude titanium obtained by molten salt electrolysis, in a high vacuum of 5×10 -5 mbar or less.
Inventors
- 👤 Kazumi Shimotori
- 👤 Yoshiharu Ochi
- 👤 Hideo Ishihara
- 👤 Takenori Umeki
- 👤 Takashi Ishigami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:25
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/129; C22B34/1295; C22B9/00; C22B9/16; C22B9/22; C22B9/228; C22C14/00; H; H10; H10W; H10W20/00; H10W20/01; H10W20/031; H10W20/032; H10W20/40; H10W20/41; H10W20/44; H10W20/4403; H10W20/4437; H10W20/4441
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A highly pure titanium comprising not more than 200 ppm of oxygen; not more than 30 ppm each of elements consisting of iron, nickel and chromium, and not more than 0.1 ppm each of elements consisting of sodium and potassium, wherein said highly pure titanium has a residual resistance ratio RRR 273 of 45 or more.
Claim 2
Dependent Claim
56 words
A highly pure titanium comprising not more than 200 ppm of oxygen; not more than 30 ppm each of elements consisting of iron, nickel and chromium, and not more than 0.1 ppm each of elements consisting of sodium and potassium, wherein said highly pure titanium has a residual resistance ratio RRR 273 of 45 or more.
Claim 3
Dependent Claim
24 words
The highly pure titanium according to claim 1, wherein said highly pure titanium comprises not more than 0.001 ppm each of uranium and thorium.
Claim 4
Dependent Claim
15 words
A highly pure titanium according to claim 1, comprising not more than 150 ppm oxygen.
Claim 5
Dependent Claim
19 words
A highly pure titanium according to claim 1, comprising not more than 0.05 ppm each of sodium and potassium.
Claim 6
Dependent Claim
22 words
A highly pure titanium according to claim 1, comprising not more than 0.8 ppm each of the elements iron, nickel and chromium.
Claim 7
Dependent Claim
19 words
A highly pure titanium according to claim 3, comprising not more than 0.05 ppm each of sodium and potassium.
Claim 8
Dependent Claim
22 words
A highly pure titanium according to claim 6, comprising not more than 0.8 ppm each of the elements iron, nickel and chromium.
Claim 9
Dependent Claim
19 words
A highly pure titanium according to claim 7, comprising not more than 0.001 ppm each of uranium and thorium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |