US2549249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drawing filled tantalum tubes
Assignee: Western Union Telegraph Co
•
Filing: 1947-01-22
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Granted: 1951-04-17
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Expires: 1967-01-22
Abstract
No abstract record available.
Inventors
- 👤 Donald S Seabury
- 👤 William D Buckingham
- 👤 Clarence R Deibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:03
CPC Classifications
B; B21; B21C; B21C9/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD OF DRAWING A TUBE OF TANTALUM OR OTHER REFRACTORY METAL ADAPTED FOR USE IN AN ELECTRODE STRUCTURE IN A CONCENTRATED ARC DISCHARGE LAMP, WHICH COMPRISES PASSING HEATING CURRENT THROUGH THE TUBE IN A HIGH VACUUM TO REMOVE OCCLUDED GASES AND IMPURITIES THEREFROM, PASSING HEATING CURRENT THROUGH A CONDUCTOR IN SAID VACUUM IN SUCH MANNER AS TO HEAT A QUANTITY OF COPPER UNTIL THE COPPER EVAPORATES AND CONDENSES ON THE OUTSIDE OF THE TUBE TO FORM A COATING THEREON, FILLING SAID TUBE WITH
Claim 2
Independent Claim
84 words
A METHOD OF DRAWING A TUBE OF TANTALUM OR OTHER REFRACTORY METAL ADAPTED FOR USE IN AN ELECTRODE STRUCTURE IN A CONCENTRATED ARC DISCHARGE LAMP, WHICH COMPRISES PASSING HEATING CURRENT THROUGH THE TUBE IN A HIGH VACUUM TO REMOVE OCCLUDED GASES AND IMPURITIES THEREFROM, PASSING HEATING CURRENT THROUGH A CONDUCTOR IN SAID VACUUM IN SUCH MANNER AS TO HEAT A QUANTITY OF COPPER UNTIL THE COPPER EVAPORATES AND CONDENSES ON THE OUTSIDE OF THE TUBE TO FORM A COATING THEREON, FILLING SAID TUBE WITH
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |