US3364375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal vapor lamp thorium coated electrode
Assignee: General Electric Co
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Filing: 1963-10-25
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Granted: 1968-01-16
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Expires: 1983-10-25
Abstract
No abstract record available.
Inventors
- 👤 Lewis V Mccarty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:47
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0735; H01J61/0737
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A HIGH PRESSURE ARC DISCHARGE LAMP COMPRISING A QUARTZ ENVELOPE CONTAINING A FILLING OF MERCURY, AN ALKALI METAL HALIDE, AND AN INERT GAS, SAID ENVELOPE HAVING ELECTRODES SEALED INTO THE ENDS THEREOF, AT LEAST ONE OF SAID ELECTRODES BEING A THERMIONIC CATHODE COMPRISING A TUNGSTEN BASE BODY HAVING THEREON A COATING OF THORIUM HAVING A THICKNESS IN THE RANGE OF 3 A. TO 2000 A., THERE BEING NO OTHER THORIUM METAL IN SAID ENVELOPE.
Claim 2
Dependent Claim
74 words
A HIGH PRESSURE ARC DISCHARGE LAMP COMPRISING A QUARTZ ENVELOPE CONTAINING A FILLING OF MERCURY, AN ALKALI METAL HALIDE, AND AN INERT GAS, SAID ENVELOPE HAVING ELECTRODES SEALED INTO THE ENDS THEREOF, AT LEAST ONE OF SAID ELECTRODES BEING A THERMIONIC CATHODE COMPRISING A TUNGSTEN BASE BODY HAVING THEREON A COATING OF THORIUM HAVING A THICKNESS IN THE RANGE OF 3 A. TO 2000 A., THERE BEING NO OTHER THORIUM METAL IN SAID ENVELOPE.
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) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |