Patent US4373144A successfully refreshed from Google Patents.
US4373144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode arrangement for an X-ray tube
Assignee: Siemens AG
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Filing: 1980-12-17
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Granted: 1983-02-08
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Expires: 2000-12-17
Abstract
Abstract In an exemplary embodiment, a cathode cup for electron focusing has a groove-like cavity for the heater coil. The cathode cup is subdivided, approximately perpendicularly to the longitudinal direction of the heater coil into several parts which are insulated from one another, to which separate control potentials can be supplied.
Inventors
- 👤 Kurt Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:32
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/06; H01J35/066
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
A cathode arrangement for an x-ray tube comprising a cathode cup for electron focusing having a groove-like cavity and having a heater coil extending in a longitudinal direction in said cavity, said cathode cup (6) being subdivided approximately perpendicularly to the longitudinal direction of the heater coil (7) to define several parts (14, 15, 16) which are insulated from one another, and means for applying separate control potentials (Ug1, Ug2) to said parts (15; 14, 16).
Claim 2
Dependent Claim
76 words
A cathode arrangement for an x-ray tube comprising a cathode cup for electron focusing having a groove-like cavity and having a heater coil extending in a longitudinal direction in said cavity, said cathode cup (6) being subdivided approximately perpendicularly to the longitudinal direction of the heater coil (7) to define several parts (14, 15, 16) which are insulated from one another, and means for applying separate control potentials (Ug1, Ug2) to said parts (15; 14, 16).
Claim 3
Dependent Claim
47 words
A cathode arrangement according to claim 1, with the cathode cup (6) consisting of three parts (14, 15, 16) each having a dimension in the longitudinal direction of the heater coil (7) which is approximately equally as great as the corresponding dimension of the other two parts.
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) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |