Patent US5265603A successfully refreshed from Google Patents.
US3140944A
Expired / Lapsed
US
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Method of sintering tungsten
Assignee: Westinghouse Electric Corp
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Filing: 1962-06-21
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Granted: 1964-07-14
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Expires: 1982-06-21
Abstract
No abstract record available.
Inventors
- 👤 Leonard L France
- 👤 Robert L Ammon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:05
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/105; Y; Y10; Y10S; Y10S75/00; Y10S75/95
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
THE METHOD OF RAPIDLY SINTERING AN ELONGATED SELFSUSTAINING TUNGSTEN COMPACT WHICH HAS A SUBSTANTIAL DEGREE OF POROSITY TO CONVERT THE POROUS COMPACT INTO A UNITARY MASS WHICH HAS SUBSTANTIALLY NO POROSITY, WHICH METHOD COMPRISES: SECURING SAID POROUS COMPACT AT ONE END AND IN A SUBSTANTIALLY VERTICAL POSITION WITH THE OTHER END OF SAID COMPACT FREE AND BELOW THE SECURED END OF SAID COMPACT; POSITIONING THE FREE END OFF SAID COMPACT PROXIMATE TO A REFRACTORY ANODE PAD, AND MAINTAINING SAID COMPACT AND SAID PAD UNDER NON-OXIDIZING CONDITIONS; APPLYING A PREDETERMINED D.C. POTENTIAL BETWEEN THE SECURED END OF SAID COMPACT AND SAID PAD TO FORM AN ELECTRIC ARC BETWEEN THE FREE END OF SAID COMPACT AND SAID PAD, WITH SAID PAD MAINTAINED AS THE ANODE OF THE FORMED ARC AND THE FREE END OF SAID COMPACT MAINTAINED AS THE
Claim 2
Independent Claim
137 words
THE METHOD OF RAPIDLY SINTERING AN ELONGATED SELFSUSTAINING TUNGSTEN COMPACT WHICH HAS A SUBSTANTIAL DEGREE OF POROSITY TO CONVERT THE POROUS COMPACT INTO A UNITARY MASS WHICH HAS SUBSTANTIALLY NO POROSITY, WHICH METHOD COMPRISES: SECURING SAID POROUS COMPACT AT ONE END AND IN A SUBSTANTIALLY VERTICAL POSITION WITH THE OTHER END OF SAID COMPACT FREE AND BELOW THE SECURED END OF SAID COMPACT; POSITIONING THE FREE END OFF SAID COMPACT PROXIMATE TO A REFRACTORY ANODE PAD, AND MAINTAINING SAID COMPACT AND SAID PAD UNDER NON-OXIDIZING CONDITIONS; APPLYING A PREDETERMINED D.C. POTENTIAL BETWEEN THE SECURED END OF SAID COMPACT AND SAID PAD TO FORM AN ELECTRIC ARC BETWEEN THE FREE END OF SAID COMPACT AND SAID PAD, WITH SAID PAD MAINTAINED AS THE ANODE OF THE FORMED ARC AND THE FREE END OF SAID COMPACT MAINTAINED AS THE
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |