US3022436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamps
Assignee: Polaroid Corp
•
Filing: 1960-01-29
•
Granted: 1962-02-20
•
Expires: 1980-01-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Dexter P Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:38
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/02; H01K1/04; H01K1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN AN INCANDESCENT LAMP, AN ATMOSPHERE COMPRIS ING AT OPERATING TEMPERATURES, HYDROGEN AND CARBON, AND A FILAMENT POSITIONED WITHIN SAID ATMOSPHERE COMPRISING TANTALUM CARBIDE AND ABOUT 20% BY WEIGHT OF AT LEAST ONE REFRACTORY METAL CARBIDE SELECTED FROM THE GROUP CONSISTING OF THE CARBIDES OF ZIRCONIUM AND HAFNIUM.
Claim 2
Dependent Claim
48 words
IN AN INCANDESCENT LAMP, AN ATMOSPHERE COMPRIS ING AT OPERATING TEMPERATURES, HYDROGEN AND CARBON, AND A FILAMENT POSITIONED WITHIN SAID ATMOSPHERE COMPRISING TANTALUM CARBIDE AND ABOUT 20% BY WEIGHT OF AT LEAST ONE REFRACTORY METAL CARBIDE SELECTED FROM THE GROUP CONSISTING OF THE CARBIDES OF ZIRCONIUM AND HAFNIUM.
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 |