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US3819971A Expired / Lapsed US ⏱️ 0.0 years remaining

Improved composite anode for rotating-anode x-ray tubes thereof

Assignee: Ultramet Inc
•
Filing: 1972-12-12
•
Granted: 1974-06-25
•
Expires: 1992-12-12
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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

  • 👤 R Kaplan
  • 👤 S Gonnella
  • 👤 W Abrams

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 04:15
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: 10
Claim 1
Independent Claim 25 words
Anode as in claim 1, wherein said coating comprises a material selected from the group consisting of tungsten and all alloys of tungsten and rhenium.
Claim 2
Dependent Claim 10 words
Anode as in claim 2, wherein said coating comprises tungsten.
Claim 3
Dependent Claim 15 words
Anode as in claim 1, wherein said scoring comprises at least one substantially annular groove.
Claim 4
Dependent Claim 26 words
Anode as in claim 4, wherein: said groove is substantially rectangular in a cross-section taken parallel to said axis; and said coating substantially fills said groove.
Claim 5
Dependent Claim 13 words
Anode as in claim 4, wherein a plurality of annular grooves is provided.
Claim 6
Dependent Claim 47 words
Anode as in claim 1, wherein said coating comprises a first, substantially non-x-ray emissive layer and a second, x-ray emissive layer: said first layer being in juxtaposition with substantially all exposed surfaces of said substrate disk; and said second layer being in juxtaposition with said first layer.
Claim 7
Dependent Claim 33 words
Anode as in claim 7, wherein said first material comprises carbon and said first layer comprises a material selected from the group consisting of: Niobium Carbide; Tantalum Carbide; Titanium Carbide; and Zirconium Carbide.
Claim 8
Dependent Claim 11 words
Anode as in claim 7, wherein: said second layer comprises Tungsten.
Claim 9
Dependent Claim 20 words
Anode as in claim 1 wherein said scoring comprises a groove which is substantially spiral with respect to said axis.
Claim 10
Dependent Claim 12 words
Anode as in claim 1 wherein said upper surface is substantially flat.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-06-24 1977-12-24 1978-06-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-06-24 1981-12-24 1982-06-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-06-24 1985-12-24 1986-06-25 $7700.00 Window Closed / Lapsed

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