Patent US4331902A successfully refreshed from Google Patents.
US4331902A
Expired / Lapsed
US
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Laminated rotary anode for X-ray tube
Assignee: US Philips Corp
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Filing: 1980-03-10
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Granted: 1982-05-25
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Expires: 2000-03-10
Abstract
Abstract A laminated rotary anode for use in an X-ray tube is provided having a structure of a first electron target layer being essentially of a first tungsten alloy, a second intermediate layer bonded to the electron target layer and consisting essentially of either tungsten or a second alloy of tungsten and having a yield point lower than that of the first tungsten alloy, and a support layer bonded at a face of the second layer with the support layer consisting essentially of one of molybdenum and molybdenum alloy.
Inventors
- 👤 Frederik Magendans
- 👤 Bernhard J. P. van Rheenen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:47
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/108; B; B23; B23K; B23K20/00; B23K20/06; H01J2235/00; H01J2235/08; H01J2235/083; H01J2235/084
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A laminated rotary anode for use in an X-ray tube having an electron target area, comprising: (a) an electron target layer consisting essentially of a first tungsten alloy; (b) a second layer bonded at a first face to said target layer and consisting essentially of one of tungsten and a second alloy of tungsten, said second layer material having a yield point lower than that of said first tungsten alloy; and (c) a support layer bonded to said second layer at a second face opposite to said target layer, said support layer consisting essentially of one of molybdenum and a molybdenum alloy.
Claim 2
Dependent Claim
102 words
A laminated rotary anode for use in an X-ray tube having an electron target area, comprising: (a) an electron target layer consisting essentially of a first tungsten alloy; (b) a second layer bonded at a first face to said target layer and consisting essentially of one of tungsten and a second alloy of tungsten, said second layer material having a yield point lower than that of said first tungsten alloy; and (c) a support layer bonded to said second layer at a second face opposite to said target layer, said support layer consisting essentially of one of molybdenum and a molybdenum alloy.
Claim 3
Dependent Claim
81 words
A rotary anode as in claim 1, wherein said target layer consists essentially of a first tungsten-rhenium alloy suitable to serve as a target layer for the electrons, said second layer consists essentially of one of tungsten and a second tungsten-rhenium alloy having a lower rhenium content, and said support layer consists essentially of a molybdenum alloy which contains from 0.4% to 0.55% by weight of titanium and from 0.06% to 0.12% by weight of zirconium and the balance essentially molybdenum.
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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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |