Patent US3244929A successfully refreshed from Google Patents.
US3244929A
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Multi-work function cathode
Assignee: Osram GmbH
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Filing: 1961-12-26
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Granted: 1966-04-05
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Kuhl Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:39
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0735; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A SINTERED ELECTRODE OF THE CHARACTER DESCRIBED, COMPRISING TWO EXPOSED ELECTRONIC EMISSIVE SINTERED ZONES A FIRST ONE OF WHICH HAS A HIGHER ELECTRONIC WORK FUNCTION THAN THE SECOND ONE AND THE SECOND ONE HAS A LOWER ELECTRONIC WORK FUNCTION THAN THE FIRST, AND SAID FIRST SINTERED ZONE COMPRISING A MIXTURE OF 5BAO$2AL2O3 WITH POWDERED TUNGSTEN IN THE RANGE OF 70-98% BY WEIGHT, AND IN WHICH THE PERCENTAGE OF AL IS IN THE RANGE OF 0.05-1.0% BY WEIGHT.
Claim 2
Dependent Claim
77 words
A SINTERED ELECTRODE OF THE CHARACTER DESCRIBED, COMPRISING TWO EXPOSED ELECTRONIC EMISSIVE SINTERED ZONES A FIRST ONE OF WHICH HAS A HIGHER ELECTRONIC WORK FUNCTION THAN THE SECOND ONE AND THE SECOND ONE HAS A LOWER ELECTRONIC WORK FUNCTION THAN THE FIRST, AND SAID FIRST SINTERED ZONE COMPRISING A MIXTURE OF 5BAO$2AL2O3 WITH POWDERED TUNGSTEN IN THE RANGE OF 70-98% BY WEIGHT, AND IN WHICH THE PERCENTAGE OF AL IS IN THE RANGE OF 0.05-1.0% BY WEIGHT.
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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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |