Patent US3900237A successfully refreshed from Google Patents.
US3900237A
Expired / Lapsed
US
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Method of making arch shaped arc tube
Assignee: GTE Sylvania Inc
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Filing: 1973-08-09
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Granted: 1975-08-19
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Expires: 1993-08-09
Abstract
Abstract In the manufacture of an arch shaped arc tube having electrodes sealed at its ends, a cylindrical tube of quartz is prepared with smaller diameter quartz tubing extending from its ends. The tube is then bent into an arch shape and electrodes are vacuum sealed into the tubing extensions, using a suitably shaped exhaust tube fastened to the center of the arc tube as a support.
Inventors
- 👤 Rudoph Marcucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:12
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/09; C03B23/099; C03B23/06; C03B23/065; C03B23/20; C03B23/207; C03B23/213; H; H01; H01J; H01J9/00; H01J9/24; H01J9/245; H01J9/247
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
In the manufacture of an arc tube for a high intensity arc discharge lamp, the steps which comprise: joining two lengths of quartz tubing to the ends of a larger diameter cylindrical quartz tube; bending the cylindrical quartz tube into an arch shape; forming an opening in the wall of the arch tube, said opening being substantially at the longitudinal center of the arch tube; joining an exhaust tube to the arch tube in alignment with said opening; bending the exhaust tube into axial alignment with one of the lengths of tubing; sealing the open end of said exhaust tube and the open end of the other length of tubing; inserting an electrode assembly including a molybdenum ribbon into said one length of tubing and vacuum sealing the tubing onto a molybdenum ribbon.
Claim 2
Dependent Claim
133 words
In the manufacture of an arc tube for a high intensity arc discharge lamp, the steps which comprise: joining two lengths of quartz tubing to the ends of a larger diameter cylindrical quartz tube; bending the cylindrical quartz tube into an arch shape; forming an opening in the wall of the arch tube, said opening being substantially at the longitudinal center of the arch tube; joining an exhaust tube to the arch tube in alignment with said opening; bending the exhaust tube into axial alignment with one of the lengths of tubing; sealing the open end of said exhaust tube and the open end of the other length of tubing; inserting an electrode assembly including a molybdenum ribbon into said one length of tubing and vacuum sealing the tubing onto a molybdenum ribbon.
Claim 3
Dependent Claim
40 words
The process of claim 1 including the step of rebending the exhaust tube into axial alignment with the other length of tubing; opening the sealed end of said other tubing; and vacuum sealing an electrode assembly in said other tubing.
Claim 4
Dependent Claim
19 words
The process of claim 2 including the step of exhausting and filling the arc tube through the exhaust tube.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |