Patent US3564317A successfully refreshed from Google Patents.
US3564317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for an x-ray tube cooled by heat-conductive coaxial cylinders
Assignee: US Philips Corp
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Filing: 1968-05-07
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Granted: 1971-02-16
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Expires: 1988-05-07
Abstract
Abstract A cathode for an X-ray tube which is mechanically rugged and cooled through coaxially arranged hollow cylinders at least one of which is joined to the cathode with good thermal conductivity and the other projects from the glass envelope of the X-ray tube, both cylinders being joined to one another.
Inventors
- 👤 Werner Berends
- 👤 Walter Hartl
- 👤 Heinz Jurgen Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:59
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/06; H01J35/066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A cathode for an X-ray tube having a metal cathode cap, characterized in that the heat generated is conducted away from the cathode cap (3) through coaxially arranged hollow cylinders (4,5,6) of which one (4) is joined to the cathode cap (3) with good thermal conductivity and another (6) projects from the glass envelop of the X-ray tube, both hollow cylinders being joined to one another, and as the case may be, to a further coaxially arranged hollow cylinder (5).
Claim 2
Dependent Claim
80 words
A cathode for an X-ray tube having a metal cathode cap, characterized in that the heat generated is conducted away from the cathode cap (3) through coaxially arranged hollow cylinders (4,5,6) of which one (4) is joined to the cathode cap (3) with good thermal conductivity and another (6) projects from the glass envelop of the X-ray tube, both hollow cylinders being joined to one another, and as the case may be, to a further coaxially arranged hollow cylinder (5).
Claim 3
Dependent Claim
44 words
A cathode for an X-ray tube as claimed in claim 1 characterized in that the intermediate member (5) which the hollow cylinders (4,6) are joined to one another is made of metal the coefficient of thermal expansion of which corresponds to that of glass.
Claim 4
Dependent Claim
39 words
A cathode for an X-ray tube as claimed in claim 1 characterized in that the hollow cylinder joined to the cathode cap is made of a metal the coefficient of thermal expansion of which corresponds to that of glass.
Claim 5
Dependent Claim
31 words
A cathode for an X-ray tube as claimed in claim 3, characterized in that the glass enveloped (13) is sealed to a hollow cylinder (4) immediately below the cathode cap (3).
Claim 6
Dependent Claim
41 words
A cathode for an X-ray tube as claimed in claim 1, characterized in that the space in the hollow cylinder is connected to the space outside the tube by a length of metal tubing (23) with serves as an exhaust tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |