Patent US3248586A successfully refreshed from Google Patents.
US3248586A
Expired / Lapsed
US
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Discharge lamp electrode
Assignee: Osram GmbH
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Filing: 1962-11-08
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Granted: 1966-04-26
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Expires: 1982-11-08
Abstract
No abstract record available.
Inventors
- 👤 Schlegel Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:14
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A CATHODE FOR A HIGH-PRESSURE GASEOUS DISCHARGE LAMP COMPRISING, A SWAGED TUNGSTEN MEMBER THAT CONTAINS A PREDETERMINED AMOUNT OF THORIUM OXIDE AND HAS A BODY PORTION AND A CONE-SHAPED TIP PORTION, AND A METAL SUPPORT ROD ATTACHED TO SAID BODY PORTION, SAID CONE-SHAPED TIP PORTION HAVING A CIRCUMFERENTIAL SLOT THEREIN THAT TRANSVERSELY DIVIDES SAID TIP PORTION INTO A POINTED ARC-SUPPORTING SEGMENT AND A TAPERED ROOT SEGMENT AND INCREASES THE OPERATING TEMPERATURE OF THE POINTED ARC-SUPPORTING SEGMENT BY REDUCING THE HEAT LOST BY CONDUCTION TO THE BODY PORTION, THE POINT OF SAID ARC-SUPPORTING SEGMENT BEING OF ROUND CONFIGURATION AND HAVING A PREDETERMINED RADIUS OF CURVATURE.
Claim 2
Dependent Claim
104 words
A CATHODE FOR A HIGH-PRESSURE GASEOUS DISCHARGE LAMP COMPRISING, A SWAGED TUNGSTEN MEMBER THAT CONTAINS A PREDETERMINED AMOUNT OF THORIUM OXIDE AND HAS A BODY PORTION AND A CONE-SHAPED TIP PORTION, AND A METAL SUPPORT ROD ATTACHED TO SAID BODY PORTION, SAID CONE-SHAPED TIP PORTION HAVING A CIRCUMFERENTIAL SLOT THEREIN THAT TRANSVERSELY DIVIDES SAID TIP PORTION INTO A POINTED ARC-SUPPORTING SEGMENT AND A TAPERED ROOT SEGMENT AND INCREASES THE OPERATING TEMPERATURE OF THE POINTED ARC-SUPPORTING SEGMENT BY REDUCING THE HEAT LOST BY CONDUCTION TO THE BODY PORTION, THE POINT OF SAID ARC-SUPPORTING SEGMENT BEING OF ROUND CONFIGURATION AND HAVING A PREDETERMINED RADIUS OF CURVATURE.
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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |