Patent US4827255A successfully refreshed from Google Patents.
Patent US3246197A successfully refreshed from Google Patents.
US3246197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode heater having an aluminum oxide and tungesten coating
Assignee: Westinghouse Electric Corp
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Filing: 1962-10-02
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Granted: 1966-04-12
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Expires: 1982-10-02
Abstract
No abstract record available.
Inventors
- 👤 Richard A Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:27
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A HEATER ADAPTED TO BE DISPOSED IN A HEAT TRANSFER RELATION WITH A CATHODE OF AN ELECTRON DISCHARGE TUBE, SAID HEATER COMPRISING AN ELECTRICALLY RESISTIVE WIRE HAVING A MULTI-LAYER COATING THEREON, SAID COATING INCLUDING A FIRST LAYER CONSISTING ESSENTIALLY OF ALUMINUM OXIDE DISPOSED UPON SAID WIRE AND A LAST LAYER HAVING ITS OUTER SURFACE EXPOSED TO SAID CATHODE, SAID LAST LAYER CONSISTING
Claim 2
Dependent Claim
62 words
A HEATER ADAPTED TO BE DISPOSED IN A HEAT TRANSFER RELATION WITH A CATHODE OF AN ELECTRON DISCHARGE TUBE, SAID HEATER COMPRISING AN ELECTRICALLY RESISTIVE WIRE HAVING A MULTI-LAYER COATING THEREON, SAID COATING INCLUDING A FIRST LAYER CONSISTING ESSENTIALLY OF ALUMINUM OXIDE DISPOSED UPON SAID WIRE AND A LAST LAYER HAVING ITS OUTER SURFACE EXPOSED TO SAID CATHODE, SAID LAST LAYER CONSISTING
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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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |