US3548244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp having twin filaments and integral filament legs mounted in a bridge
Assignee: British Lighting Industries Ltd
•
Filing: 1968-07-01
•
Granted: 1970-12-15
•
Expires: 1988-07-01
Abstract
No abstract record available.
Inventors
- 👤 Henry A Fenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:07
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2246808A
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US2564040A
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US2733377A
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GB863467A
Cited
US3116992A
Cited
US3287591A
Cited
AT242235B
Cited
US3345526A
Cited
US3364377A
Cited
US3441774A
Cited
US3441772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |