US2897107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annealing properties of copper
Assignee: Bolidens Gruvaktiebolag
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Filing: 1956-01-26
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Granted: 1959-07-28
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Expires: 1976-01-26
Abstract
No abstract record available.
Inventors
- 👤 Carlen Solve
- 👤 Lundquist Sven Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:13
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
IN A METHOD FOR IMPROVING THE ANNEALING PROPERTIES OF ELECTROLYTICALLY PURE COPPER WHICH, DUE TO ITS CONTAINING SULFUR AND METALLIC ELEMENTS AS IMPURITIES, SAID SULFUR BEING IN A QUANTITY OF UP TO 25 GRAMS PER TON OF COPPER, HAS A RECRYSTALLIZATION TEMPERATURE OF ABOVE 200* C. THE IMPROVEMENT WHICH COMPRISES ADDING BETWEEN ABOUT 1040 GRAMS OF LEAD PER TON OF COPPER WHEREBY THE RECRYSTALLIZATION TEMPERATURE IS LOWERED TO BELOW 200* C. AND THEN HEAT TREATING THE COPPER TO A TEMPERATURE BETWEEN ABOUT 400* C. AND 600* C.
References Cited (Backward Citations)
US2732294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |