US2806970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron emission coatings and method of preparing air stabilized barium oxide
Assignee: Westinghouse Electric Corp
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Filing: 1954-03-01
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Granted: 1957-09-17
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Expires: 1974-03-01
Abstract
No abstract record available.
Inventors
- 👤 Meister George
- 👤 Thomas H Heine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:35
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
A FLUORESCENT LAMP COMPRISING A SEALED LIGHT-TRANSMITTING ENVELOPE CARRYING A COATING OF FLUORESCENT MATERIAL ON THE INNER WALL THEREOF, A QUALITY OF MERCURY AND TRODES IN SAID ENVELOPE, AND AN ELECTRON-EMMISSION COATING ON SAID ELECTRODES, SAID COATING COMPRISING AIR-STABILIZED BARIUM OXIDE PARTICLES, SAID AIR-STABLIZED BARIUM OXIDE PARTICLES CONSISTING OF FROM 80% TO 99% BY WEIGHT BARIUM OXIDE AND FROM 20% TO 1% BY WEIGHT BARIUM ZIRCONATE, THE BARIUM OXIDE PORTION OF EACH OF SAID AIR-STABILIZED PARTICLES ENCASED AN AIR-PROTECTIVE SHELL OF BARIUM ZIRCONATE.
References Cited (Backward Citations)
US2530394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |