Patent US2207941A successfully refreshed from Google Patents.
US3535577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular electric incandescent lamp with filament and current supply wires spaced from tube walls
Assignee: US Philips Corp
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Filing: 1967-11-14
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Granted: 1970-10-20
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Expires: 1987-11-14
Abstract
No abstract record available.
Inventors
- 👤 Victor Rosallie Notelteirs
- 👤 Franciscus Ludovicus Wijnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:14
CPC Classifications
H; H01; H01K; H01K5/00; H01K5/02; H01K1/00; H01K1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US263304A
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US1925648A
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US2523033A
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US2675497A
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US3039015A
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US3080497A
Cited
GB946149A
Cited
US3237045A
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US3250941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |