Patent US2809890A successfully refreshed from Google Patents.
US2809890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloys for indirectly-heated cathodes
Assignee: Superior Tube Co
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Filing: 1955-11-15
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Granted: 1957-10-15
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Expires: 1975-11-15
Abstract
No abstract record available.
Inventors
- 👤 Ardrey M Bounds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:31
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/26; C; C22; C22C; C22C19/00; C22C19/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A METALLIC CATHODE ELEMENT OF THE INDIRECTLY-HEATED OXIDE-COATED TYPE CHARATERIZED BY ELECTRICAL PROPERTIES OF RAPID ACTIVATION, ENHANCED EMISSSION, INCREASED LIFE AND PERMANENT LOW ELECTRICAL IMPEDANCE OF THE BOND TO THE CATHODE COATING AND BY THE MECHANICAL PROPERTIES OF EASE OF FORMATION BY METAL-WORKING STEPS AND RESISTANCE TO DEFORMATION WHEN SUBJECTED TO SEVERE SHOCK, SAID ELE-
Claim 2
Dependent Claim
55 words
A METALLIC CATHODE ELEMENT OF THE INDIRECTLY-HEATED OXIDE-COATED TYPE CHARATERIZED BY ELECTRICAL PROPERTIES OF RAPID ACTIVATION, ENHANCED EMISSSION, INCREASED LIFE AND PERMANENT LOW ELECTRICAL IMPEDANCE OF THE BOND TO THE CATHODE COATING AND BY THE MECHANICAL PROPERTIES OF EASE OF FORMATION BY METAL-WORKING STEPS AND RESISTANCE TO DEFORMATION WHEN SUBJECTED TO SEVERE SHOCK, SAID ELE-
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) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |