US2692349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-pressure mercury vapor discharge lamp
Assignee: Hartford National Bank and Trust Co
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Filing: 1953-09-02
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Granted: 1954-10-19
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Expires: 1973-09-02
Abstract
No abstract record available.
Inventors
- 👤 Ouweltjes Jan Lourens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A LOW-PRESSURE MERCURY-VAPOR DISCHARGE LAMP COMPRISING AN ENVELOPE INCLUDING A WAL. PERVIOUS TO LIGHT, A LAYER OF RED LUMINESCENT MAGNESIUM ARSENATE IN WHICH THE RATIO BETWEEN MAGNESIA AND ARESENIC PENTOXIDE LIES IN THE RANGE BETWEEN 4:1 AND 10:1 AND WHICH IS ACTIVATED WITH A QUANTITY OF MANGANESE BETWEEN 1X10-3 AND 10X10-3 ATOMS PER MAGNESIUM ATOM BEING DISPOSED ON THE INSIDE SURFACE OF SAID WALL, AND ANOTHER LUMINESCENT LAYER WHICH EMITS CHIEFLY BETWEEN 4500 AND 6000 A. DISPOSED ON THE INNER SURFACE OF SAID MAGNESIUM ARSENATE LAYER.
Claim 2
Dependent Claim
86 words
A LOW-PRESSURE MERCURY-VAPOR DISCHARGE LAMP COMPRISING AN ENVELOPE INCLUDING A WAL. PERVIOUS TO LIGHT, A LAYER OF RED LUMINESCENT MAGNESIUM ARSENATE IN WHICH THE RATIO BETWEEN MAGNESIA AND ARESENIC PENTOXIDE LIES IN THE RANGE BETWEEN 4:1 AND 10:1 AND WHICH IS ACTIVATED WITH A QUANTITY OF MANGANESE BETWEEN 1X10-3 AND 10X10-3 ATOMS PER MAGNESIUM ATOM BEING DISPOSED ON THE INSIDE SURFACE OF SAID WALL, AND ANOTHER LUMINESCENT LAYER WHICH EMITS CHIEFLY BETWEEN 4500 AND 6000 A. DISPOSED ON THE INNER SURFACE OF SAID MAGNESIUM ARSENATE LAYER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |