US3717784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten halogen lamp with tungsten mesh deflector
Assignee: GTE Sylvania Inc
•
Filing: 1970-06-25
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Granted: 1973-02-20
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Expires: 1990-06-25
Abstract
Abstract A HIGH POWER TUNGSTEN HALOGEN LAMP IN WHICH A CONVECTION SHIELD IS USED NEAR THE BASE TO CONTROL REDEPOSITION OF TUNGSTEN ON THE FILAMENT AND PREVENT THE FORMATION OF NEEDLE-LIKE CRYSTALS EXTENDING OUT OF THE FILAMENT.
Inventors
- 👤 W Matheson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:48
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/52; H01K1/54
Claims Analysis
Total Claims: 0
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |