Patent US4731796A successfully refreshed from Google Patents.
Patent US3118080A successfully refreshed from Google Patents.
US3118080A
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Tungsten dispenser cathodes and impregnants therefor
Assignee: Semicon Associates Inc
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Filing: 1959-12-10
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Granted: 1964-01-14
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Expires: 1979-12-10
Abstract
No abstract record available.
Inventors
- 👤 Otto G Koppius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:54
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
A METHOD OF FABRICATING A DISPENSER CATHODE COMPRISING THE STEPS OF FORMING A POROUS BODY OF SINTERED TUNGSTEN AND IMPREGNATING THE PORES OF SAID BODY WITH A MIXTURE OF AN ALKALINE EARTH METAL OXIDE AND A TUNGSTATE OF AN ALKALINE EARTH METAL.
Claim 2
Independent Claim
42 words
A METHOD OF FABRICATING A DISPENSER CATHODE COMPRISING THE STEPS OF FORMING A POROUS BODY OF SINTERED TUNGSTEN AND IMPREGNATING THE PORES OF SAID BODY WITH A MIXTURE OF AN ALKALINE EARTH METAL OXIDE AND A TUNGSTATE OF AN ALKALINE EARTH METAL.
Claim 3
Dependent Claim
36 words
A DISPENSER CATHODE COMPRISING A POROUS BODY OF SINTERED TUNGSTEN, THE PORES OF SAID BODY BEING IMPREGNATED WITH A MIXTURE CONSISTING ESSENTIALLY OF AN ALKALINE EARTH METAL OXIDE AND A TUNGSTATE OF AN ALKALINE EARTH METAL.
Claim 4
Dependent Claim
36 words
A DISPENSER CATHODE COMPRISING A POROUS BODY OF SINTERED TUNGSTEN, THE PORES OF SAID BODY BEING IMPREGNATED WITH A MIXTURE CONSISTING ESSENTIALLY OF AN ALKALINE EARTH METAL OXIDE AND A TUNGSTATE OF AN ALKALINE EARTH METAL.
References Cited (Backward Citations)
US944139A
Cited
US1993187A
Cited
US2173259A
Cited
US2353635A
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US2700118A
Cited
US2813807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |