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Patent US2596469A successfully refreshed from Google Patents.
US2596469A
Expired / Lapsed
US
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Tantalum carbide filament electric lamp containing hydrogen-volatile hydrocarbon mixture
Assignee: Polaroid Corp
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Filing: 1951-02-27
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Granted: 1952-05-13
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Expires: 1971-02-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Dexter P Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:49
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/02; H01K1/04; H01K1/10; H01K1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
IN AN ELECTRIC LAMP, A FILAMENT COMPRISING ESSENTIALLY TANTALUM CARBIDE POSITIONED WITHIN AN
Claim 2
Dependent Claim
13 words
IN AN ELECTRIC LAMP, A FILAMENT COMPRISING ESSENTIALLY TANTALUM CARBIDE POSITIONED WITHIN AN
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) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |