US3886392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing alumina arc tube
Assignee: GTE Sylvania Inc
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Filing: 1974-02-25
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Granted: 1975-05-27
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Expires: 1994-02-25
Abstract
Abstract A niobium metal tube is sealed in the axial hole of a cylindrical alumina plug using a high temperature sealing glass. The plug is then sealed, at a lower temperature, in the end of an alumina arc tube.
Inventors
- 👤 Nikolaos Barakitis
- 👤 Edward A Webb
- 👤 Jr Francis B Makar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:38
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/025; H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/76; C04B2237/765; C04B2237/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
AN ARC TUBE FOR A HIGH PRESSURE SODIUM LAMP COMPRISING: AN ALUMINA ARC TUBE HAVING A CYLINDRICAL ALUMINA PLUG SEALED AT EACH END THEREOF, EACH PLUG HAVING A LARGE AND A SMALL DIAMETER SECTION, THE SMALL DIAMETER SECTION BEING INSERTED INTO THE ARC TUBE AND THE LARGE DIAMETER BEING OUTSIDE THE ARC TUBE, THE CAPILLARY SPACE BETWEEN THE SMALL DIAMETER SECTION AND THE INNER WALL OF THE ARC TUBE BEING FILLED WITH A SEALING GLASS, THE CAPILLARY SPACE BETWEEN THE LARGE DIAMETER SECTION AND THE END OF THE ARC TUBE BEING FILLED WITH A SEALING GLASS, A NIOBIUM TUBE, HAVING A RAISED PERIPHERAL SEATING RING INTERMEDIATE ITS ENDS, EXTENDING THROUGH SAID PLUG SO THAT SAID RING IS IN CONTACT WITH THE OUTER SURFACE OF SAID PLUG, SAID NIOBIUM TUBE BEING SEALED TO SAID PLUG FROM SAID SEATING RING ALONG THE ENTIRE LENGTH OF SAID PLUG BY A SEALING GLASS, AND AN ELECTRODE DISPOSED ON THE INNER END OF SAID NIOBIUM TUBE.
Claim 2
Dependent Claim
161 words
AN ARC TUBE FOR A HIGH PRESSURE SODIUM LAMP COMPRISING: AN ALUMINA ARC TUBE HAVING A CYLINDRICAL ALUMINA PLUG SEALED AT EACH END THEREOF, EACH PLUG HAVING A LARGE AND A SMALL DIAMETER SECTION, THE SMALL DIAMETER SECTION BEING INSERTED INTO THE ARC TUBE AND THE LARGE DIAMETER BEING OUTSIDE THE ARC TUBE, THE CAPILLARY SPACE BETWEEN THE SMALL DIAMETER SECTION AND THE INNER WALL OF THE ARC TUBE BEING FILLED WITH A SEALING GLASS, THE CAPILLARY SPACE BETWEEN THE LARGE DIAMETER SECTION AND THE END OF THE ARC TUBE BEING FILLED WITH A SEALING GLASS, A NIOBIUM TUBE, HAVING A RAISED PERIPHERAL SEATING RING INTERMEDIATE ITS ENDS, EXTENDING THROUGH SAID PLUG SO THAT SAID RING IS IN CONTACT WITH THE OUTER SURFACE OF SAID PLUG, SAID NIOBIUM TUBE BEING SEALED TO SAID PLUG FROM SAID SEATING RING ALONG THE ENTIRE LENGTH OF SAID PLUG BY A SEALING GLASS, AND AN ELECTRODE DISPOSED ON THE INNER END OF SAID NIOBIUM TUBE.
References Cited (Backward Citations)
US3450924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |