US4873052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a scandate dispenser cathode and scandate dispenser cathode manufactured according to the method
Assignee: US Philips Corp
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Filing: 1986-08-22
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Granted: 1989-10-10
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Expires: 2006-08-22
Abstract
Abstract A method of manufacturing a scandate dispenser cathode having a matrix (1) at least the top layer of which consists substantially of a mixture of tungsten with scandium oxide or with a mixed oxide comprising scandium oxide. When sintering of the matrix is carried out at a temperature between 1300° and 1700° C., preferably at approximately 1500° C. and in a hydrogen atmosphere, cathodes are obtained having a better recovery after ion bombardment compared with cathodes sintered at 1900° C. Sintering in hydrogen results in a better reproducibility.
Inventors
- 👤 Jan Hasker
- 👤 Johannes van Esdonk
- 👤 Wim Kwestroo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:44
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A method of manufacturing a scandate dispenser cathode having a matrix at least the top layer of which consists substantially of a mixture of tungsten (W) with scandium oxide (Sc 2 O 3 ) or with a mixed oxide comprising scandium oxide, characterized in that the matrix is sintered at a temperature between 1300° and approximately 1500° C. in hydrogen.
Claim 2
Independent Claim
60 words
A method of manufacturing a scandate dispenser cathode having a matrix at least the top layer of which consists substantially of a mixture of tungsten (W) with scandium oxide (Sc 2 O 3 ) or with a mixed oxide comprising scandium oxide, characterized in that the matrix is sintered at a temperature between 1300° and approximately 1500° C. in hydrogen.
Claim 3
Dependent Claim
36 words
A scandate dispenser cathode manufactured by means of a method as claimed in claim 1, characterized in that the matrix is a tungsten matrix having a top layer of a mixture of scandium oxide and tungsten.
Claim 4
Dependent Claim
44 words
A scandate dispenser cathode manufactured by means of a method as claimed in claim 2, characterized in that it is an impregnated cathode and the quantity of impregnant incorporated in the matrix is between 2 and 6% by weight of the total impregnated matrix.
Claim 5
Dependent Claim
21 words
A method as claimed in claim 1, characterized in that sintering is carried out at a temperature of approximately 1500° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |