Patent US3566067A successfully refreshed from Google Patents.
US3566067A
Expired / Lapsed
US
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Method of sealing off a refractory metal tubulation by tube-in-circuit electric heating
Assignee: Philips North America LLC
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Filing: 1968-05-14
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Granted: 1971-02-23
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Expires: 1988-05-14
Abstract
Abstract A method of sealing off the refractory metal exhaust tubulation of a ceramic arc tube containing a rare gas at less than atmospheric pressure. The method primarily comprises, pinching or flattening a portion of the exhaust tubulation, disposing the arc tube and tubulation within an inert atmosphere at a pressure greater than that of the rare gas within the arc tube and passing a predetermined amount of electrical energy through the tubulation causing it to separate and form a vacuumtight seal at the separated edges.
Inventors
- 👤 Daniel A Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:20
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; H; H01; H01J; H01J9/00; H01J9/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
31 words
The method of sealing off the refractory metal exhaust tubulation of a ceramic arc tube according to claim 1 wherein the inert atmosphere in which said tubulation is confined is argon.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |