US3313974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure electric discharge device having electrodes with thorium on the exposed surface thereof
Assignee: GTE Sylvania Inc
•
Filing: 1963-05-02
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Granted: 1967-04-11
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Expires: 1983-05-02
Abstract
No abstract record available.
Inventors
- 👤 Koury Frederic
- 👤 John F Waymouth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:41
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0735
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A HIGH PRESSURE ELECTRIC DISCHARGE DEVICE COMPRISING AN ARC TUBE; A FILLING IN SAID ARC TUBE COMPRISING MERCURY ATOMS AND IODINE ATOMS; A PAIR OF ELECTRODES HAVING A COATING OF THORIUM METAL DISPOSED UPON THE EXPOSED SURFACE THEREOF IN ORDER TO SUPPLY THORIUM ATOMS TO THE ARC DISCHARGE.
Claim 2
Dependent Claim
48 words
A HIGH PRESSURE ELECTRIC DISCHARGE DEVICE COMPRISING AN ARC TUBE; A FILLING IN SAID ARC TUBE COMPRISING MERCURY ATOMS AND IODINE ATOMS; A PAIR OF ELECTRODES HAVING A COATING OF THORIUM METAL DISPOSED UPON THE EXPOSED SURFACE THEREOF IN ORDER TO SUPPLY THORIUM ATOMS TO THE ARC DISCHARGE.
References Cited (Backward Citations)
US2740186A
Cited
US2691853A
Cited
US2916653A
Cited
US3234421A
Cited
US3153169A
Cited
US3170081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |