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Patent US2655952A successfully refreshed from Google Patents.
US2655952A
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Method of forming lamp filaments
Assignee: GTE Sylvania Inc
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Filing: 1949-05-28
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Granted: 1953-10-20
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Expires: 1969-05-28
Abstract
No abstract record available.
Inventors
- 👤 Mann Oliver
- 👤 Ralph B Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:49
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/02; H01K3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1013958A
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US1591833A
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US1726480A
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US1906449A
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US2128437A
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US2454318A
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GB596485A
Cited
US2439893A
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US2449653A
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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) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |