Patent US2820920A successfully refreshed from Google Patents.
US2820920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of coated electrodes
Assignee: Claude Ets
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Filing: 1952-09-17
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Granted: 1958-01-21
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Expires: 1972-09-17
Abstract
No abstract record available.
Inventors
- 👤 Penon Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:58
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/142; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49881
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
AN ELECTRODE FOR ELECTRIC DISCHARGE LAMPS COMPRISING A MOLYBDENUM FILAMENT WOUND INTO A HELIX AND CARRYING WITHIN ITS COILS A MIXTURE OF ABOUT 42% OF BARIUM DIOXIDE, ABOUT 27% OF METALLIC TANTALUM POWDER, ABOUT 25% OF MONO HYDRATED BARIUM HYDROXIDE AND ABOUT 6% OF BARIUM CARBONATE.
Claim 2
Dependent Claim
46 words
AN ELECTRODE FOR ELECTRIC DISCHARGE LAMPS COMPRISING A MOLYBDENUM FILAMENT WOUND INTO A HELIX AND CARRYING WITHIN ITS COILS A MIXTURE OF ABOUT 42% OF BARIUM DIOXIDE, ABOUT 27% OF METALLIC TANTALUM POWDER, ABOUT 25% OF MONO HYDRATED BARIUM HYDROXIDE AND ABOUT 6% OF BARIUM CARBONATE.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |