Patent US2719786A successfully refreshed from Google Patents.
US2719786A
Expired / Lapsed
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Method of making a tungsten-nickel alloy filament
Assignee: RCA Corp
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Filing: 1949-10-29
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Granted: 1955-10-04
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Expires: 1969-10-29
Abstract
No abstract record available.
Inventors
- 👤 Mark N Fredenburgh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:45
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
METHOD OF MAKING AN ALLOY OF TUNGSTEN AND NICKEL, COMPRISING MIXING IN PASTE FROM POWDERS FO TUNGSTEN AND NICKEL HAVING A PARTICLE SIZE OF UP TO THREE MICRONS IN DIAMETER AND IN THE RELATIVE AMOUNTS OF FROM 8% TO 15% NICKEL AND FROM 92% TO 85% TUNGSTEN, CONTINUOUSLY EXTRUDING SAID PASTE TO DESIRED FILAMENTARY SHAPE TO FORM A MOVING EXTRUSION, SUPPORTING THE MOVING EXTRUSION FOR SUSPENSION ONLY FROM BOTH ENDS THEREOF, AND HEATING SUCCESSIVE PORTIONS OF THE MOVING EXTRUSION SO SUPPORTED AND WHOLLY FREE FROM CONTACT WITH CONTAMINATING MATERIALS IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE OF FROM 1450* C. TO 1650* C. TO SINTER THE METAL PARTICLES IN SAID POWDERS TO FORM A TUNGSTENNICKEL ALLOY FILAMENT, SAID MOVING EXTRUSION HAVING A HOT STRENGTH SUFFICIENT FOR PREVENTING APPRECIABLE ELONGATION THEREOF WHEN SUBJECTED TO SAID TEMPERATURE.
Claim 2
Dependent Claim
135 words
METHOD OF MAKING AN ALLOY OF TUNGSTEN AND NICKEL, COMPRISING MIXING IN PASTE FROM POWDERS FO TUNGSTEN AND NICKEL HAVING A PARTICLE SIZE OF UP TO THREE MICRONS IN DIAMETER AND IN THE RELATIVE AMOUNTS OF FROM 8% TO 15% NICKEL AND FROM 92% TO 85% TUNGSTEN, CONTINUOUSLY EXTRUDING SAID PASTE TO DESIRED FILAMENTARY SHAPE TO FORM A MOVING EXTRUSION, SUPPORTING THE MOVING EXTRUSION FOR SUSPENSION ONLY FROM BOTH ENDS THEREOF, AND HEATING SUCCESSIVE PORTIONS OF THE MOVING EXTRUSION SO SUPPORTED AND WHOLLY FREE FROM CONTACT WITH CONTAMINATING MATERIALS IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE OF FROM 1450* C. TO 1650* C. TO SINTER THE METAL PARTICLES IN SAID POWDERS TO FORM A TUNGSTENNICKEL ALLOY FILAMENT, SAID MOVING EXTRUSION HAVING A HOT STRENGTH SUFFICIENT FOR PREVENTING APPRECIABLE ELONGATION THEREOF WHEN SUBJECTED TO SAID TEMPERATURE.
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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) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |