Patent US4392238A successfully refreshed from Google Patents.
US4392238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary anode for an X-ray tube and method of manufacturing such an anode
Assignee: US Philips Corp
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Filing: 1980-07-14
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Granted: 1983-07-05
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Expires: 2000-07-14
Abstract
Abstract A rotary anode comprising a basic body of carbon whose surface is provided with a pyrolytic graphite coating having a crystallographic layer structure. A metallic layer of high-melting temperature, in which X-rays are generated during operation in an X-ray tube, is provided on the body. The metallic layer and the pyrolytic graphite coating have a common contact face which cuts through the crystallographic layers in the pyrolytic graphite. Heat developed in the metallic layer is discharged through the face into the pyrolytic graphite layers.
Inventors
- 👤 Bernhard Lersmacher
- 👤 Hans Lydtin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:37
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: 9
Claim 1
Independent Claim
60 words
A rotary anode for an X-ray tube including: (a) a carbon body; (b) a pyrolytic graphite coating on the body's surface, having a plurality of crystallographic layers extending parallel to said surface, said coating being cut through at an angle exposing ends of the crystallographic layers to form a face; and (c) an X-ray generating metallic layer on said face.
Claim 2
Dependent Claim
60 words
A rotary anode for an X-ray tube including: (a) a carbon body; (b) a pyrolytic graphite coating on the body's surface, having a plurality of crystallographic layers extending parallel to said surface, said coating being cut through at an angle exposing ends of the crystallographic layers to form a face; and (c) an X-ray generating metallic layer on said face.
Claim 3
Dependent Claim
32 words
A rotary anode as in claim 1 where the carbon body includes a raised annular portion having ends of the cystallographic layers on the portion exposed to form a heat radiating face.
Claim 4
Dependent Claim
36 words
A rotary anode as in claim 1 where the carbon body includes a groove in which a gap in the pyrolytic graphite coating on the body is located, said gap serving as a thermal conduction barrier.
Claim 5
Dependent Claim
27 words
A rotary anode as in claim 1, 9, 2 or 3 where the carbon body includes a raised annular portion on which the metallic layer is located.
Claim 6
Dependent Claim
25 words
A rotary anode as in claim 4, where the raised annular portion on which the metallic layer is located comprises interconnected foils of pressed graphite.
Claim 7
Independent Claim
68 words
A method of manufacturing a rotary anode for an X-ray tube comprising: (a) depositing a pyrolytic graphite coating on the surface of a carbon anode body, said coating having a plurality of crystallographic layers extending parallel to said surface; (b) cutting through the coating at an angle exposing ends of the crystallographic layers to form a face; and (c) providing an X-ray generating metallic layer on said face.
Claim 8
Independent Claim
68 words
A method of manufacturing a rotary anode for an X-ray tube comprising: (a) depositing a pyrolytic graphite coating on the surface of a carbon anode body, said coating having a plurality of crystallographic layers extending parallel to said surface; (b) cutting through the coating at an angle exposing ends of the crystallographic layers to form a face; and (c) providing an X-ray generating metallic layer on said face.
Claim 9
Dependent Claim
34 words
A method as in claim 6 where the rotary anode is subjected to heat treatment at a temperature between 2500° and 3500° C., after the pyrolytic graphite coating is deposited on the anode body.
References Cited (Backward Citations)
US3539859A
Cited
US3591822A
Cited
US3710162A
Cited
DE2061007A1
Cited
DE2146918A1
Cited
DE2152049A1
Cited
US3969131A
Cited
DE2440988A1
Cited
US4090103A
Cited
US3982148A
Cited
US4132917A
Cited
US4335327A
Cited
DE2910138A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |