Patent US2422303A successfully refreshed from Google Patents.
US2422303A
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Hollow magnetic shell assembly
Assignee: Mantle Lamp Company of America
•
Filing: 1945-01-27
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Granted: 1947-06-17
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Expires: 1965-01-27
Abstract
No abstract record available.
Inventors
- 👤 Frederick N Jacob
- 👤 Martin J Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:24
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/043; Y; Y10; Y10S; Y10S297/00; Y10S297/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL29255C
Cited
US640314A
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US946619A
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US977738A
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US1634923A
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US1712011A
Cited
US2130815A
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US2080837A
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US2158613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-16 | 1950-12-16 | 1951-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-16 | 1954-12-16 | 1955-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-16 | 1958-12-16 | 1959-06-17 | $7700.00 | Window Closed / Lapsed |