Patent US1750827A successfully refreshed from Google Patents.
Patent US3022439A successfully refreshed from Google Patents.
US3022439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamps
Assignee: Polaroid Corp
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Filing: 1960-03-11
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Granted: 1962-02-20
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Expires: 1980-03-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Dexter P Cooper
- 👤 Hazel M Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:37
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; H01K1/52; H01K1/54; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
IN AN INCANDESCENT LAMP, A FILAMENT COMPRISING A MAJOR PERCENTAGE OF TANTALUM CARBIDE POSITIONED WITHIN AN ATMOSPHERE COMPRISING, AT OPERATING TEMPERATURES, HYDROGEN, VAPORIZED CARBON AND AT LEAST TWO HALOGEN
Claim 2
Dependent Claim
29 words
IN AN INCANDESCENT LAMP, A FILAMENT COMPRISING A MAJOR PERCENTAGE OF TANTALUM CARBIDE POSITIONED WITHIN AN ATMOSPHERE COMPRISING, AT OPERATING TEMPERATURES, HYDROGEN, VAPORIZED CARBON AND AT LEAST TWO HALOGEN
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |