US3836807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary anode for x-ray tubes
Assignee: Siemens AG
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Filing: 1973-03-01
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Granted: 1974-09-17
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Expires: 1993-03-01
Abstract
Abstract An x-ray tube anode of the rotary type has a target surface formed by a thin layer of tungsten/rhenium alloy, supported by laminates comprising first a tungsten alloy lamination comprising at least 70 percent tungsten by weight and behind this a molybdenum alloy lamination, the anode being made by powdered metal technology so the three components are integrated with a porosity of low value. The target surface is resistant to roughening and the anode is substantially free from the development of cracks even when heavily loaded.
Inventors
- 👤 H Schreiner
- 👤 E Geldner
- 👤 H Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:04
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/108
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
The anode of claim 1 in which said first lamination is from about 0.05 to about 1 mm. thick.
Claim 2
Dependent Claim
19 words
The anode of claim 1 in which said third lamination is from about 2 to about 6 mm. thick.
Claim 3
Dependent Claim
71 words
The anode of claim 1 in which said first layer is from about 0.05 to about 1 mm. thick, said second layer is from about 1 to about 5 mm. thick and said third lamination is from about 2 to about 6 mm. thick, said anode having a beveled peripheral portion forming an electron beam focus target annulus and the latter being from about 5 to about 12 mm. thick overall.
Claim 4
Dependent Claim
46 words
The anode of claim 1 in which said first lamination is an alloy consisting of tungsten and from about 3 to about 20 percent by weight of one or more alloying metals selected from the class consisting of zirconium, hafnium, niobium, tantalum, rhenium, osmium, or iridium.
Claim 5
Dependent Claim
43 words
The anode of claim 1 in which said second lamination is a tungsten alloy consisting of by weight of at least 70 percent tungsten with the balance being one or more alloying metals selected from the class consisting of niobium, tantalum and zirconium.
Claim 6
Dependent Claim
47 words
The anode of claim 1 in which said third lamination is a molybdenum alloy consisting of molybdenum and from about 0.05 to about 20 percent by weight of one or more alloying metals selected from the class consisting of titanium, zirconium, hafnium, niobium, tantalum, tungsten, and rhenium.
Claim 7
Dependent Claim
137 words
The anode of claim 4 in which said first lamination is an alloy consisting of tungsten and from about 3 to about 20 percent by weight of one or more alloying metals selected from the class consisting of zirconium, hafnium, niobium, tantalum, rhenium, osmium, or iridium, said second lamination is a tungsten alloy consisting by weight of at least 70 percent by weight of tungsten with the balance being one or more alloying metals selected from the class consisting of niobium, tantalum and zirconium, and said third lamination is a molybdenum alloy consisting of molybdenum and from about 0.05 percent to about 20 percent by weight of one or more alloying metals selected from the class consisting of titanium zirconium, hafnium, niobium, tantalum, tungsten, and rhenium, said lamination thickness prevailing throughout said electron beam focus target annulus.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |