US2948609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of metal articles from
Assignee: —
•
Filing: —
•
Granted: 1960-08-09
•
Expires: 1977-08-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:43
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/105; B22F2998/00; B22F2998/10; B22F2999/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A METHOD OF MANUFACTURING TUNGSTEN ARTICLES FROM TUNGSTEN METAL POWDER CONTAINING NON-TUNGSTEN INGREDIENTS IN THE FORM OF ADDITIVES AND IMPURITIES, WHICH COMPRISES PRESSING POROUS BARS FROM SAID POWDER, SINTERING SAID BARS BY HEATING THEM BY MEANS OF AN ELECTRIC CURRENT OF GRADUALLY INCREASING STRENGTH UP TO A TEMPERATURE BELOW FUSION TEMPERATURE OF THE BARS, BUT HIGHER THAN A MODERATE RANGE OF TEMPERATURE WHICH CORRESPONDS TO THE PASSAGE OF CURRENT THROUGH SAID BARS OF BETWEEN A LOWER LIMIT OF 30% AND AN UPPER LIMIT OF 60% OF THE CURRENT REQUIRED TO FUSE SAID BARS, REMOVING EXCESS QUANTITIES OF NON-TUNGSTEN INGREDIENTS FROM THE STILL POROUS BARS BY HEATING SAID BARS AT TEMPERATURES IN THE RANGE BETWEEN SAID LOWER LIMIT AND SAID UPPER LIMIT, EFFECTING SAID REMOVAL OF SAID EXCESS QUANTITIES OF NON-TUNGSTEN INGREDIENTS UP TO AN EXTENT ENSURING THAT THE FINISHED BARS CONTAIN NON-TUNGSTEN INGREDIENTS IN A USEFUL QUANTITY NOT EXCEEDING THE ORDER OF MAGNITUDE OF 0.001%.
Claim 2
Independent Claim
155 words
A METHOD OF MANUFACTURING TUNGSTEN ARTICLES FROM TUNGSTEN METAL POWDER CONTAINING NON-TUNGSTEN INGREDIENTS IN THE FORM OF ADDITIVES AND IMPURITIES, WHICH COMPRISES PRESSING POROUS BARS FROM SAID POWDER, SINTERING SAID BARS BY HEATING THEM BY MEANS OF AN ELECTRIC CURRENT OF GRADUALLY INCREASING STRENGTH UP TO A TEMPERATURE BELOW FUSION TEMPERATURE OF THE BARS, BUT HIGHER THAN A MODERATE RANGE OF TEMPERATURE WHICH CORRESPONDS TO THE PASSAGE OF CURRENT THROUGH SAID BARS OF BETWEEN A LOWER LIMIT OF 30% AND AN UPPER LIMIT OF 60% OF THE CURRENT REQUIRED TO FUSE SAID BARS, REMOVING EXCESS QUANTITIES OF NON-TUNGSTEN INGREDIENTS FROM THE STILL POROUS BARS BY HEATING SAID BARS AT TEMPERATURES IN THE RANGE BETWEEN SAID LOWER LIMIT AND SAID UPPER LIMIT, EFFECTING SAID REMOVAL OF SAID EXCESS QUANTITIES OF NON-TUNGSTEN INGREDIENTS UP TO AN EXTENT ENSURING THAT THE FINISHED BARS CONTAIN NON-TUNGSTEN INGREDIENTS IN A USEFUL QUANTITY NOT EXCEEDING THE ORDER OF MAGNITUDE OF 0.001%.
References Cited (Backward Citations)
US1731255A
Cited
US1141469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |