US4335327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-Ray tube target having pyrolytic amorphous carbon coating
Assignee: Varian Medical Systems Inc
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Filing: 1980-04-18
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Granted: 1982-06-15
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Expires: 2000-04-18
Abstract
Abstract An X-ray tube including a tubular envelope having therein an anode target provided with a surface portion made of X-ray emissive material and with another surface portion coated with amorphous carbon material, and an electron emitting cathode disposed to beam electrons onto the surface portion of the target made of X-ray emissive material.
Inventors
- 👤 John S. Waugh
- 👤 Richard G. Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:28
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/105
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
27 words
An X-ray target comprising: a body having a first surface portion made of X-ray emissive material and a second surface portion coated with pyrolytic amorphous carbon material.
Claim 2
Dependent Claim
27 words
An X-ray target comprising: a body having a first surface portion made of X-ray emissive material and a second surface portion coated with pyrolytic amorphous carbon material.
Claim 3
Dependent Claim
29 words
An X-ray target as set forth in claim 1 wherein the first surface portion comprises a surface layer of X-ray emissive material mechanically and thermally coupled to the body.
Claim 4
Dependent Claim
17 words
An X-ray target as set forth in claim 3 wherein the body is made of graphite material.
Claim 5
Dependent Claim
18 words
An X-ray target as set forth in claim 3 wherein the body is made of molybdenum alloy material.
Claim 6
Dependent Claim
70 words
An X-ray tube including: an evacuable envelope; an X-ray target body mounted in the envelope and having a first surface portion made of X-ray emissive material and a second surface portion coated with pyrolytic amorphous carbon material; and means disposed in the envelope and spaced from the target body for beaming electrons onto the first surface portion thereof and generating X-rays which pass in a beam out of the tube.
Claim 7
Dependent Claim
70 words
An X-ray tube including: an evacuable envelope; an X-ray target body mounted in the envelope and having a first surface portion made of X-ray emissive material and a second surface portion coated with pyrolytic amorphous carbon material; and means disposed in the envelope and spaced from the target body for beaming electrons onto the first surface portion thereof and generating X-rays which pass in a beam out of the tube.
Claim 8
Dependent Claim
17 words
An X-ray tube as set forth in claim 5 wherein the target body comprises a rotatable disc.
Claim 9
Dependent Claim
37 words
An X-ray tube as set forth in claim 6 wherein the first surface portion comprises an annular focal track layer of the X-ray emissive material mechanically and thermally coupled to the disc adjacent the outer periphery thereof.
Claim 10
Dependent Claim
39 words
An X-ray tube as set forth in claim 7 wherein the second surface portion comprises a heat emissive coating of the amorphous carbon material mechanically and thermally coupled to surfaces of the disc outside of the focal track layer.
Claim 11
Dependent Claim
30 words
An X-ray tube a set forth in claim 8 wherein the X-ray emissive material of the focal track layer also is disposed between the disc and the heat emissive coating.
Claim 12
Independent Claim
65 words
A method for providing an X-ray target body with a coating of amorphous carbon material and comprising the steps of: heating the target body to a temperature greater than twelve hundred degrees Centrigrade and less than eighteen hundred degrees Centigrade; and flowing a carbonaceous gas over the target body to cause amorphous carbon material to deposit out of the gas and coat the target body.
Claim 13
Independent Claim
65 words
A method for providing an X-ray target body with a coating of amorphous carbon material and comprising the steps of: heating the target body to a temperature greater than twelve hundred degrees Centrigrade and less than eighteen hundred degrees Centigrade; and flowing a carbonaceous gas over the target body to cause amorphous carbon material to deposit out of the gas and coat the target body.
Claim 14
Independent Claim
85 words
A method for providing an X-ray target body with a heat emissive coating of amorphous carbon material and comprising the steps of: masking one or more surface areas of the target body; placing the target body in a furnace chamber; heating the target body to a temperature greater than twelve hundred degrees Centigrade and less than eighteen hundred degrees Centigrade; and flowing a carbonaceous gas over the target body to produce a coating of amorphous carbon material on unmasked surface areas of the target body.
Claim 15
Independent Claim
85 words
A method for providing an X-ray target body with a heat emissive coating of amorphous carbon material and comprising the steps of: masking one or more surface areas of the target body; placing the target body in a furnace chamber; heating the target body to a temperature greater than twelve hundred degrees Centigrade and less than eighteen hundred degrees Centigrade; and flowing a carbonaceous gas over the target body to produce a coating of amorphous carbon material on unmasked surface areas of the target body.
References Cited (Backward Citations)
CA752025A
Cited
US2863083A
Cited
DE2117956A1
Cited
DE2146918A1
Cited
DE2152049A1
Cited
US3969131A
Cited
JPS50105173A
Cited
US4090103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |