Patent US2668252A successfully refreshed from Google Patents.
US2668252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp
Assignee: Hartford National Bank and Trust Co
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Filing: 1951-11-23
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Granted: 1954-02-02
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Expires: 1971-11-23
Abstract
No abstract record available.
Inventors
- 👤 Ouweltjes Jan Lourens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:36
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
AN ELECTRIC LAMP COMPRISING A HIGH-PRESSURE MERCURY VAPOUR DISCHARGE TUBE, A HERMETICALLY SEALED BULB SURROUNDING SAID TUBE AND SPACED THEREFROM, A COATING ON THE WALL OF THE SAID BULB OF A LUMINESCENT SUBSTANCE ACTIVATED WITH MANGANESE AND CONTAINING MAGNESIUM, ARSENIC AND OXYGEN AND HAVING A GRAM MOLECULE RATIO BETWEEN MAGNESIUM OXIDE AND ARSENIC OXIDE EXCEEDING 3:1, AND A FILLING OF CARBON DIOXIDE HAVING A PRESSURE OF AT LEAST 0.2 CM. OF MERCURY IN THE SPACE BETWEEN THE TUBE AND THE BULB.
Claim 2
Dependent Claim
81 words
AN ELECTRIC LAMP COMPRISING A HIGH-PRESSURE MERCURY VAPOUR DISCHARGE TUBE, A HERMETICALLY SEALED BULB SURROUNDING SAID TUBE AND SPACED THEREFROM, A COATING ON THE WALL OF THE SAID BULB OF A LUMINESCENT SUBSTANCE ACTIVATED WITH MANGANESE AND CONTAINING MAGNESIUM, ARSENIC AND OXYGEN AND HAVING A GRAM MOLECULE RATIO BETWEEN MAGNESIUM OXIDE AND ARSENIC OXIDE EXCEEDING 3:1, AND A FILLING OF CARBON DIOXIDE HAVING A PRESSURE OF AT LEAST 0.2 CM. OF MERCURY IN THE SPACE BETWEEN THE TUBE AND THE BULB.
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) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |