US4800581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray tube
Assignee: Toshiba Corp
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Filing: 1987-10-22
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Granted: 1989-01-24
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Expires: 2007-10-22
Abstract
Abstract An X-ray tube is provided with a target that radiates primarily the characteristic X-ray of molybdenum. The target has an electron focal area of molybdenum base alloy containing molybdenum as a major component, and at least one of titanium and a combination of potassium oxide and silicon dioxide.
Inventors
- 👤 Masaji Kujirai
- 👤 Yoshio Fukuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:25
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
An X-ray tube comprising: cathode means for emitting electrons; and target means for radiating primarily characteristic X-rays of molybdenum, including an electron focal area thereon for bombardment by the emitted electrons, the electron focal area including a molybdenum base alloy containing at least one of titanium and potassium oxide-silicon dioxide.
Claim 2
Dependent Claim
50 words
An X-ray tube comprising: cathode means for emitting electrons; and target means for radiating primarily characteristic X-rays of molybdenum, including an electron focal area thereon for bombardment by the emitted electrons, the electron focal area including a molybdenum base alloy containing at least one of titanium and potassium oxide-silicon dioxide.
Claim 3
Dependent Claim
40 words
The X-ray tube according to claim 1, wherein said target means includes a supporting base for supporting said electron focal area; said supporting base also including a molybdenum base alloy containing at least one of titanium and potassium oxide-silicon dioxide.
Claim 4
Dependent Claim
18 words
The X-ray tube according to claim 1, wherein the molybdenum base alloy contains titanium and also contains carbon.
Claim 5
Dependent Claim
22 words
The X-ray tube according to claim 1, wherein the molybdenum base alloy contains about 0.3 to about 4 wt % of titanium.
Claim 6
Dependent Claim
31 words
The X-ray tube according to claim 3 wherein the molybdenum base alloy contains about 0.3 to about 4 wt % of titanium and about 50 to about 400 ppm of carbon.
Claim 7
Dependent Claim
35 words
The X-ray tube according to claim 1, wherein the molybdenum base alloy contains a combination of about 0.01 to about 0.1 wt % potassium oxide and about 0.02 to about 0.3 wt % silicon dioxide.
Claim 8
Dependent Claim
40 words
The X-ray tube according to claim 1, wherein the molybdenum base alloy contains about 0.3 to about 4 wt % titanium, about 0.01 to about 0.1 wt % potassium oxide and about 0.02 to about 0.3 wt % silicon dioxide.
Claim 9
Dependent Claim
21 words
The X-ray tube according to claim 1, wherein said electron focal area has a thickness of at least about 0.2 mm.
References Cited (Backward Citations)
GB1121407A
Cited
US3610984A
Cited
US3737699A
Cited
US3778654A
Cited
JPS60198045A
Cited
US4731805A
Cited
JPS6215739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-24 | 1992-07-25 | 1993-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-24 | 1996-07-25 | 1997-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-24 | 2000-07-25 | 2001-01-24 | $7700.00 | Window Closed / Lapsed |