US3635701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for refining the grain size of metals
Assignee: PETER W DAVIES
•
Filing: 1969-11-13
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Granted: 1972-01-18
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Expires: 1989-11-13
Abstract
Abstract In the grain refining of metals and alloys by introducing oxide particles into the molten metal to act as nuclei while it solidifies, the nuclei are introduced as internally oxidized particles of a metal carrier. Examples of such metal carriers are copper alloys containing 90 percent or more copper, the oxides in them being of nickel, cobalt or iron.
Inventors
- 👤 Peter W Davies
- 👤 John P Dennison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:17
CPC Classifications
B; B22; B22D; B22D1/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
A process according to claim 1 in which said nuclei are not greater than 1 micron in size.
Claim 2
Dependent Claim
23 words
A process according to claim 1 in which said metal carrier is in the form of strip from 0.05 to 0.4 mm. thick.
Claim 3
Dependent Claim
22 words
A process according to claim 1 in which the metal that is internally oxidized to form said carrier is a single-phase alloy.
Claim 4
Dependent Claim
55 words
A process according to claim 1 in which said melt is an alloy comprising nickel and copper with from 0 to 50 percent iron, and said metal carrier is formed by internal oxidation of an alloy containing at least 90 percent copper, the remainder being metal selected from the group consisting of nickel and cobalt.
Claim 5
Dependent Claim
67 words
A process according to claim 1 in which said melt is an alloy comprising from 20 to 80 percent nickel, 5 to 35 percent chromium, 0 to 40 percent cobalt and 0 to 50 percent iron, and said metal carrier is formed by internal oxidation of an alloy containing at least 90 percent copper, the remainder being metal selected from the group consisting of nickel and cobalt.
Claim 6
Dependent Claim
55 words
A process according to claim 1 in which said melt comprises copper and aluminum which solidifies to form a single-phase alloy, and the metal of said carrier is formed by internal oxidation of an alloy containing at least 90 percent copper, the remainder being metal selected from the group consisting of iron, nickel and cobalt.
Claim 7
Dependent Claim
57 words
A process according to claim 1 in which said melt comprises copper and aluminum which solidifies to form an alloy containing the beta-phase, and the metal of said carrier is formed by internal oxidation of an alloy containing at least 90 percent copper, the remainder being metal selected from the group consisting of iron, nickel and cobalt.
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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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |