US3887723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabrication of composite anode for rotating-anode x-ray tubes
Assignee: Individual
•
Filing: 1972-03-22
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Granted: 1975-06-03
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Expires: 1992-03-22
Abstract
Abstract Disclosed is an improved composite anode for rotating-anode xray tubes and an improved method of fabrication thereof. The anode comprises a substrate disk, a portion of whose focal track is scored, for example by scratching or engraving of one or more annular grooves of rectangular cross-section. A coating of x-ray emissive material covers the scored region. In certain embodiments of the invention, the emissive coating is undercoated with an interlayer of a material which is a poor emitter of xrays. The emissive coating and/or the undercoating may cover other portions of the disk and, in particular, may cover all exposed surfaces thereof. The method comprises providing such a disk, scoring it in the focal track region and applying an x-ray emissive coating to the scored region. The last step may be preceded by the application of an undercoating of a material which is a poor x-ray emitter. Either or both coatings may be applied to other surfaces of the disk.
Inventors
- 👤 Richard B Kaplan
- 👤 Sebastian Gonnella
- 👤 Walter M Abrams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:25
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/108; H01J2235/00; H01J2235/08; H01J2235/083; H01J2235/084
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
136 words
The method of fabricating a composite anode for a rotating anode x-ray tube, comprising the steps of: providing a substrate disk of carbon, said disk having an axis, a substantially frusto-conical upper surface and a lower surface, said upper and lower surface each being substantially symmetric about said axis; forming, in the sloped region of said upper surface, at least one substantially annular groove; and applying to said grooved substrate disk a coating comprising: a first layer in juxtaposition with substantially all exposed surfaces of said substrate disk, said first layer comprising a material selected from the group consisting of niobium carbide, tantalum carbide, titanium carbide, and zirconium carbide; and a second layer in juxtaposition with said first layer, said second layer comprising a material having the ability to emit x-rays in response to electron bombardment.
Claim 2
Independent Claim
136 words
The method of fabricating a composite anode for a rotating anode x-ray tube, comprising the steps of: providing a substrate disk of carbon, said disk having an axis, a substantially frusto-conical upper surface and a lower surface, said upper and lower surface each being substantially symmetric about said axis; forming, in the sloped region of said upper surface, at least one substantially annular groove; and applying to said grooved substrate disk a coating comprising: a first layer in juxtaposition with substantially all exposed surfaces of said substrate disk, said first layer comprising a material selected from the group consisting of niobium carbide, tantalum carbide, titanium carbide, and zirconium carbide; and a second layer in juxtaposition with said first layer, said second layer comprising a material having the ability to emit x-rays in response to electron bombardment.
Claim 3
Independent Claim
151 words
The method of fabricating a composite anode for a rotating-anode x-ray tube, comprising the steps of: providing a substrate disk of carbon, said disk having an axis, a substantially frusto-conical upper surface and a lower surface, said upper and lower surface each being substantially symmetric about said axis; scoring at least a portion of the sloped region of said upper surface; applying to at least a part of said scored, sloped region, a coating, said coating comprising: a first layer comprising a material selected from the group consisting of niobium carbide, tantalum carbide, titanium carbide and zirconium carbide, said first layer being applied in juxtaposition with said scored, sloped region, at least a portion of said first layer caused to extend into said scoring; and a second layer in juxtaposition with said first layer, said second layer comprising a material having the ability to emit x-rays in response to electron bombardment.
Claim 4
Independent Claim
151 words
The method of fabricating a composite anode for a rotating-anode x-ray tube, comprising the steps of: providing a substrate disk of carbon, said disk having an axis, a substantially frusto-conical upper surface and a lower surface, said upper and lower surface each being substantially symmetric about said axis; scoring at least a portion of the sloped region of said upper surface; applying to at least a part of said scored, sloped region, a coating, said coating comprising: a first layer comprising a material selected from the group consisting of niobium carbide, tantalum carbide, titanium carbide and zirconium carbide, said first layer being applied in juxtaposition with said scored, sloped region, at least a portion of said first layer caused to extend into said scoring; and a second layer in juxtaposition with said first layer, said second layer comprising a material having the ability to emit x-rays in response to electron bombardment.
Claim 5
Dependent Claim
18 words
Method as in claim 2 wherein said step of scoring comprises forming at least one substantially annular groove.
Claim 6
Independent Claim
114 words
The method of fabricating a composite anode for a rotating-anode x-ray tube, comprising the steps of: providing a substrate disk of a first refractory material, said disk having an axis, a substantially frusto-conical upper surface and a lower surface; said upper and lower surface, each being substantially symmetric about said axis; scoring at least a portion of the sloped region of said upper surface; and applying to at least a part of said scored, sloped region, a coating comprising a second material differing from said first material, said second material having the ability to emit x-rays in response to electron bombardment, at least a portion of said coating caused to extend into said scoring.
Claim 7
Independent Claim
114 words
The method of fabricating a composite anode for a rotating-anode x-ray tube, comprising the steps of: providing a substrate disk of a first refractory material, said disk having an axis, a substantially frusto-conical upper surface and a lower surface; said upper and lower surface, each being substantially symmetric about said axis; scoring at least a portion of the sloped region of said upper surface; and applying to at least a part of said scored, sloped region, a coating comprising a second material differing from said first material, said second material having the ability to emit x-rays in response to electron bombardment, at least a portion of said coating caused to extend into said scoring.
Claim 8
Independent Claim
114 words
THE METHOD OF FABRICATING A COMPOSITE ANODE FOR A ROTATING-ANODE X-RAY TUBE, COMPRISING THE STEPS OF: PROVIDING A SUBSTRATE DISK OF A FIRST REFRACTORY MATERIAL, SAID DISK HAVING AN AXIS, A SUBSTANTIALLY FRUSTO-CONICAL UPPER SURFACE AND A LOWER SURFACE; SAID UPPE AND LOWER SURFACE, EACH BEING SUBSTANTIALLY SUMMETRIC ABOUT SAID AXIS; SCORING AT LEAST A PORTION OF THE SLOPED REGION OF SAID UPPER SURFACE; AND APPLYING TO AT LEAST A PART OF SAID SCORED, SLOPED REGION, A COATING COMPRISING A SECOND MATERIAL DIFFERING FROM SAID FIRST MATERIAL, SAID SECOND MATERIAL HAVING THE ABILITY TO EMIT X-RAYS IN RESPONSE TO ELECTRON BOMBARDMENT, AT LEAST A PORTION OF SAID COATING CAUSED TO EXTEND INTO SAID SCORING.
Claim 9
Independent Claim
114 words
THE METHOD OF FABRICATING A COMPOSITE ANODE FOR A ROTATING-ANODE X-RAY TUBE, COMPRISING THE STEPS OF: PROVIDING A SUBSTRATE DISK OF A FIRST REFRACTORY MATERIAL, SAID DISK HAVING AN AXIS, A SUBSTANTIALLY FRUSTO-CONICAL UPPER SURFACE AND A LOWER SURFACE; SAID UPPE AND LOWER SURFACE, EACH BEING SUBSTANTIALLY SUMMETRIC ABOUT SAID AXIS; SCORING AT LEAST A PORTION OF THE SLOPED REGION OF SAID UPPER SURFACE; AND APPLYING TO AT LEAST A PART OF SAID SCORED, SLOPED REGION, A COATING COMPRISING A SECOND MATERIAL DIFFERING FROM SAID FIRST MATERIAL, SAID SECOND MATERIAL HAVING THE ABILITY TO EMIT X-RAYS IN RESPONSE TO ELECTRON BOMBARDMENT, AT LEAST A PORTION OF SAID COATING CAUSED TO EXTEND INTO SAID SCORING.
Claim 10
Dependent Claim
12 words
Method as in claim 4 wherein said first refractory material is non-metallic.
Claim 11
Dependent Claim
25 words
Method as in claim 4, wherein said step of scoring comprises forming at least one groove in substantially spiral fashion with respect to said axis.
Claim 12
Dependent Claim
19 words
Method as in claim 4, wherein said coating is applied to substantially all exposed surfaces of said substrate disk.
Claim 13
Dependent Claim
24 words
Method as in claim 7, wherein said coating comprIses a material selected from the group consisting of tungsten and alloys of tungsten and rhenium.
Claim 14
Dependent Claim
18 words
Method as in claim 8, wherein said coating comprises tungsten; said step of applying comprises chemical vapor deposition.
Claim 15
Dependent Claim
18 words
Method as in claim 4, wherein said step of scoring comprises forming at least one substantially annular groove.
Claim 16
Dependent Claim
13 words
Method as in claim 10, wherein a plurality of annular grooves is formed.
Claim 17
Dependent Claim
53 words
Method as in claim 10, wherein said coating is applied in a first, substantially non-x-ray-emissive layer and a second, x-ray emissive layer: said first layer being applied in juxtaposition with said grooved, sloped surface and the surfaces of the groove therein; and said second layer being applied in juxtaposition with said first layer.
Claim 18
Dependent Claim
20 words
Method as in claim 12, wherein said first layer is applied to substantially all exposed surfaces of said substrate disk.
Claim 19
Dependent Claim
20 words
Method as in claim 12, wherein: said second layer comprises tungsten; and said step of applying comprises chemical vapor deposition.
Claim 20
Dependent Claim
36 words
Method as in claim 10, wherein: said groove is provided so as to be substantially quadrilateral in a cross-section taken parallel to said axis; and said coating is applied so as to substantially fill said groove.
Claim 21
Dependent Claim
11 words
Method as in claim 15, wherein said quadrilateral comprises a rectangle.
Claim 22
Dependent Claim
76 words
Method as in claim 15, wherein said coating is applied in a first, substantially non-x-ray-emissive layer and a second, x-ray emissive layer: said first layer being selectively applied within the groove in juxtaposition with the surfaces thereof, so that upon application thereof, the opening of said groove is narrower than the base thereof; and said second layer being applied so that at least a portion thereof is within said groove in juxtaposition with said first layer.
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |