US3127641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten tube manufacture
Assignee: General Electric Co
•
Filing: 1961-10-05
•
Granted: 1964-04-07
•
Expires: 1981-10-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth S G Pertwee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:03
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/04; C23C16/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD OF MAKING TUNGSTEN TUBING WHICH COMPRISES FLOWING A MIXTURE OF HYDROGEN AND TUNGSTEN HEXAFLUORIDE THROUGH THE INTERIOR OF A COPPER REACTION TUBE WHILE PROGRESSIVELY HEATING THE TUBE TO A TEMPERATURE OF ABOUT 600-800*C. IN A LONGITUDIANLLY NARROW ANNULAR ZONE THEREOF WHICH MOVES SLOWLY ALONG THE LENGTH OF THE REACTION TUBE AT A SUBSTANTIALLY UNIFORM RATE TO THEREBY EFFECT CHEMICAL REACTION OF THE HYDROGEN AND TUNGSTEN HEXAFLUORIDE AND DEPOSITION OF TUNGSTEN IN A LAYER ON THE INTERIOR OF SAID REACTION TUBE, CONTROLLING THE THICKNESS OF THE TUNGSTEN LAYER BY REPEATEDLY MOVING THE HEATED ANNULAR ZONE BACK AND FORTH ALONG THE LENGTH OF THE REACTION TUBE WHILE CONTINUING THE FLOW OF HYDROGEN AND TUNGSTEN HEXAFLUORIDE, AND SUBSEQUENTLY REMOVING THE REACTION TUBE.
Claim 2
Independent Claim
121 words
THE METHOD OF MAKING TUNGSTEN TUBING WHICH COMPRISES FLOWING A MIXTURE OF HYDROGEN AND TUNGSTEN HEXAFLUORIDE THROUGH THE INTERIOR OF A COPPER REACTION TUBE WHILE PROGRESSIVELY HEATING THE TUBE TO A TEMPERATURE OF ABOUT 600-800*C. IN A LONGITUDIANLLY NARROW ANNULAR ZONE THEREOF WHICH MOVES SLOWLY ALONG THE LENGTH OF THE REACTION TUBE AT A SUBSTANTIALLY UNIFORM RATE TO THEREBY EFFECT CHEMICAL REACTION OF THE HYDROGEN AND TUNGSTEN HEXAFLUORIDE AND DEPOSITION OF TUNGSTEN IN A LAYER ON THE INTERIOR OF SAID REACTION TUBE, CONTROLLING THE THICKNESS OF THE TUNGSTEN LAYER BY REPEATEDLY MOVING THE HEATED ANNULAR ZONE BACK AND FORTH ALONG THE LENGTH OF THE REACTION TUBE WHILE CONTINUING THE FLOW OF HYDROGEN AND TUNGSTEN HEXAFLUORIDE, AND SUBSEQUENTLY REMOVING THE REACTION TUBE.
References Cited (Backward Citations)
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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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |