US4953190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal emissive coating for x-ray targets
Assignee: General Electric Co
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Filing: 1989-06-29
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Granted: 1990-08-28
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Expires: 2009-06-29
Abstract
Abstract A high thermal emittance coating for an x-ray tube anode target which permits broader application parameters and a stable coating. The coating is composed of Al 2 O 3 present in an amount of 50% to 80% by weight and ZrO 2 or La 2 O 3 and TiO 2 present in an amount of 50% to 20% by weight with the TiO 2 and ZrO 2 or La 2 O 3 being present in a ratio in the range of 1:1 to 10:1. A preferable coating is composed of about 80% by weight of Al 2 O 3 and 20% by weight of TiO 2 and ZrO 2 .
Inventors
- 👤 Dennis G. Kukoleck
- 👤 Peter C. Eloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:25
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/105
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
An x-ray tube anode comprised of a body having a surface region for being impinged by electrons to produce x-radiation and a coating distinct from said region for enhancing the thermal emittance of said body, said coating composed of a metal oxide coating comprising: Al 2 O 3 present in an amount of 50% to 80% by weight and TiO 2 together with ZrO 2 or La 2 O 3 present in an amount of 50% to 20% by weight with the TiO 2 being present with respect to the ZrO 2 or La 2 O 3 in a ratio in the range of 1:1 to 10:1.
Claim 2
Dependent Claim
107 words
An x-ray tube anode comprised of a body having a surface region for being impinged by electrons to produce x-radiation and a coating distinct from said region for enhancing the thermal emittance of said body, said coating composed of a metal oxide coating comprising: Al 2 O 3 present in an amount of 50% to 80% by weight and TiO 2 together with ZrO 2 or La 2 O 3 present in an amount of 50% to 20% by weight with the TiO 2 being present with respect to the ZrO 2 or La 2 O 3 in a ratio in the range of 1:1 to 10:1.
Claim 3
Dependent Claim
44 words
The anode as defined in claim 1 wherein said Al 2 O 3 is present in an amount of about 80% by weight and said ZrO 2 and said TiO 2 are present in an amount by weight of about 20% of said coating.
Claim 4
Dependent Claim
29 words
The anode as defined in claim 1 wherein said ZrO 2 is present in an amount by weight in the range of about 2% to 25% of said coating.
Claim 5
Dependent Claim
24 words
The anode as defined in claim 1 wherein said ZrO 2 is present in an amount by weight of about 2% of said coating.
Claim 6
Dependent Claim
20 words
The anode as defined in claim 1 wherein said ZrO 2 and said TiO 2 are present in equal amounts.
Claim 7
Dependent Claim
14 words
The anode as defined in claim 1 wherein said ZrO 2 is calcia stabilized.
Claim 8
Dependent Claim
136 words
A coating material for an x-ray tube anode comprised of a body having a surface region for being impinged by electrons to produce x-radiation, the coating adapted to be applied distinct from said region for enhancing the thermal emittance of said body, comprising: a coating composed of a metal oxide mixture comprising Al 2 O 3 particles present in an amount of 50% to 80% by weight and TiO 2 together with ZrO 2 or La 2 O 3 present in an amount of 50% to 20% by weight with the TiO 2 being present with respect to the ZrO 2 or La 2 O 3 in a ratio in the range of 1:1 to 10:1, said coating characterized by said aluminum oxide particles projecting from said coating when said coating is fused to said anode.
Claim 9
Dependent Claim
136 words
A coating material for an x-ray tube anode comprised of a body having a surface region for being impinged by electrons to produce x-radiation, the coating adapted to be applied distinct from said region for enhancing the thermal emittance of said body, comprising: a coating composed of a metal oxide mixture comprising Al 2 O 3 particles present in an amount of 50% to 80% by weight and TiO 2 together with ZrO 2 or La 2 O 3 present in an amount of 50% to 20% by weight with the TiO 2 being present with respect to the ZrO 2 or La 2 O 3 in a ratio in the range of 1:1 to 10:1, said coating characterized by said aluminum oxide particles projecting from said coating when said coating is fused to said anode.
Claim 10
Dependent Claim
49 words
The coating material as defined in claim 7 wherein said Al 2 O 3 is present in an amount of about 80% by weight and said ZrO 2 and said TiO 2 are present in an amount by weight in the range of about 20% of said coating material.
Claim 11
Dependent Claim
31 words
The coating material as defined in claim 7 wherein said ZrO 2 is present in an amount by weight in the range of about 2% to 25% of said coating material.
Claim 12
Dependent Claim
25 words
The coating material as defined in claim 7 wherein said ZrO 2 is present in an amount by weight of about 2% of said coating.
Claim 13
Dependent Claim
21 words
The coating material as defined in claim 7 wherein said ZrO 2 and said TiO 2 are present in equal amounts.
Claim 14
Dependent Claim
15 words
The coating material as defined in claim 7 wherein said ZrO 2 is calcia stabilized.
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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) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |