US3278301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of dense sintered articles
Assignee: Rio Tinto Switzerland AG
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Filing: 1964-03-26
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Granted: 1966-10-11
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Expires: 1984-03-26
Abstract
No abstract record available.
Inventors
- 👤 Solomir John George
- 👤 Akeret Rudolf
- 👤 Douady Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:48
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32; C04B33/326; B; B22; B22F; B22F3/00; B22F3/003; B22F3/12; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0036; Y; Y10; Y10S; Y10S425/00; Y10S425/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
METHOD FOR THE MANUFACTURE OF DENSE SINTERED COMPACTS HAVING A LOW GAS CONTENT, MADE FROM METAL POWDER, IN WHICH ALUMINUM POWDER COVERED WITH ALUMINUM OXIDE IS COLD-PRESSED TO GIVE COLD-COMPACTS, WITHOUT BEING WRAPPED, BEING HEATED AND SINTERED FOR SEVERAL HOURS IN THE HEATED PORTION OF A GASTIGHT CHAMBER AT A TEMPERATURE SLIGHTLY BELOW THE MELTING POINT OF ALUMINUM, SAID COMPACTS BEING THEREBY DEGASSED, AND THEN, STILL IN SAID VACUUM, MOVED TO ANOTHER PORTION OF SAID GASTIGHT CHAMBER AND IN SAID PORTION OF SAID CHAMBER HOT-UPSET IN THE CONTAINER OF A PRESS, AND COLD-COMPACTS BEING HEATED UP FOR DEGASIFICATION AND SINTERING IN THE COURSE OF 1 TO 10 HOURS, AND KEPT FOR A FURTHER 2 TO 100 HOURS AT A TEMPERATURE OF 500 TO 650*C., TOWARDS THE END OF SAID HEAT-TREATMENT A VACUUM OF LESS THAN 10 MM. HG BEING ACHIEVED AND KEPT FOR AT LEAST ONE HOUR.
Claim 2
Dependent Claim
147 words
METHOD FOR THE MANUFACTURE OF DENSE SINTERED COMPACTS HAVING A LOW GAS CONTENT, MADE FROM METAL POWDER, IN WHICH ALUMINUM POWDER COVERED WITH ALUMINUM OXIDE IS COLD-PRESSED TO GIVE COLD-COMPACTS, WITHOUT BEING WRAPPED, BEING HEATED AND SINTERED FOR SEVERAL HOURS IN THE HEATED PORTION OF A GASTIGHT CHAMBER AT A TEMPERATURE SLIGHTLY BELOW THE MELTING POINT OF ALUMINUM, SAID COMPACTS BEING THEREBY DEGASSED, AND THEN, STILL IN SAID VACUUM, MOVED TO ANOTHER PORTION OF SAID GASTIGHT CHAMBER AND IN SAID PORTION OF SAID CHAMBER HOT-UPSET IN THE CONTAINER OF A PRESS, AND COLD-COMPACTS BEING HEATED UP FOR DEGASIFICATION AND SINTERING IN THE COURSE OF 1 TO 10 HOURS, AND KEPT FOR A FURTHER 2 TO 100 HOURS AT A TEMPERATURE OF 500 TO 650*C., TOWARDS THE END OF SAID HEAT-TREATMENT A VACUUM OF LESS THAN 10 MM. HG BEING ACHIEVED AND KEPT FOR AT LEAST ONE HOUR.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |