Patent US2814748A successfully refreshed from Google Patents.
US2814748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp
Assignee: Duro Test Corp
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Filing: 1953-12-24
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Granted: 1957-11-26
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Expires: 1973-12-24
Abstract
No abstract record available.
Inventors
- 👤 James L Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:11
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/24; H01J61/26; H01J61/04; H01J61/06; H01J61/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A FLUORESCENT LAMP COMPRISING AN EVACUATED ENVELOPE HAVING AN IONIZABLE LOW PRESSURE ATMOSPHERE AND AN INTERIOR COATING OF FLUORESCENT MATERIAL, A PAIR OF ELECTRON EMISSIVE ELECTRODES MOUNTED WITHIN AND AT EACH END OF SAID ENVELOPE, EACH PAIR OF SAID ELECTRODES CONSISTING OF PARALLEL CONNECTED CONDUCTORS CARRYING ELECTRON EMISSIVE COATINGS, AT LEAST ONE OF SAID ELECTRODES HAVING A COATING OF GETTER MATERIAL LOCATED BETWEEN ITS CONDUCTOR AND ITS ELECTRON EMISSIVE COATING, THE CONDUCTORS OF EACH PAIR OF ELECTRODES BEING LONGITUDINALLY SPACED ON THE AXIS
Claim 2
Dependent Claim
84 words
IN A FLUORESCENT LAMP COMPRISING AN EVACUATED ENVELOPE HAVING AN IONIZABLE LOW PRESSURE ATMOSPHERE AND AN INTERIOR COATING OF FLUORESCENT MATERIAL, A PAIR OF ELECTRON EMISSIVE ELECTRODES MOUNTED WITHIN AND AT EACH END OF SAID ENVELOPE, EACH PAIR OF SAID ELECTRODES CONSISTING OF PARALLEL CONNECTED CONDUCTORS CARRYING ELECTRON EMISSIVE COATINGS, AT LEAST ONE OF SAID ELECTRODES HAVING A COATING OF GETTER MATERIAL LOCATED BETWEEN ITS CONDUCTOR AND ITS ELECTRON EMISSIVE COATING, THE CONDUCTORS OF EACH PAIR OF ELECTRODES BEING LONGITUDINALLY SPACED ON THE AXIS
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) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |