Patent US2622221A successfully refreshed from Google Patents.
US2622221A
Expired / Lapsed
US
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Fluorescent discharge lamp
Assignee: Westinghouse Electric Corp
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Filing: 1945-11-23
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Granted: 1952-12-16
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Expires: 1965-11-23
Abstract
No abstract record available.
Inventors
- 👤 Norman C Beese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:48
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/16; H01J61/70; H01J61/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A FLUORESCENT LAMP COMPRISING A TRANSPARENT ENVELOPE PHOSPHOR-COATED ON ITS INTERIOR SURFACE AND CONTAINING, AS A FILLING, A MIXTURE OF ONLY RARE GASES CONSISTING OF HELIUM AND XENON, THE TOTAL PRESSURE OF THE MIXTURE BEING BETWEEN 1/2 MM. AND 3 MM. OF MERCURY, AND THE PERCENTAGE, BY VOLUME, OF THE XENON RANGING FROM 2 TO 2 1/2%.
Claim 2
Dependent Claim
57 words
A FLUORESCENT LAMP COMPRISING A TRANSPARENT ENVELOPE PHOSPHOR-COATED ON ITS INTERIOR SURFACE AND CONTAINING, AS A FILLING, A MIXTURE OF ONLY RARE GASES CONSISTING OF HELIUM AND XENON, THE TOTAL PRESSURE OF THE MIXTURE BEING BETWEEN 1/2 MM. AND 3 MM. OF MERCURY, AND THE PERCENTAGE, BY VOLUME, OF THE XENON RANGING FROM 2 TO 2 1/2%.
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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) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |