US4857266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion strengthened copper
Assignee: United States Department of Energy
•
Filing: 1988-12-05
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Granted: 1989-08-15
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Expires: 2008-12-05
Abstract
Abstract A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.
Inventors
- 👤 Haskell Sheinberg
- 👤 Thomas T. Meek
- 👤 Rodger D. Blake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:42
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/105; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A method for making a composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide or copper having a coating of copper oxide, said method comprising; a oxidizing at least a portion of copper which is in the form of a powder to form particles, each particle consisting of copper having a thin film of copper oxide on its surface; b. consolidating said powder and particles to form a workpiece; and c. exposing said workpiece to microwave radiation in an inert atmosphere until a surface of said workpiece reaches a temperature of at least 500° C.
Claim 2
Independent Claim
108 words
A method for making a composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide or copper having a coating of copper oxide, said method comprising; a oxidizing at least a portion of copper which is in the form of a powder to form particles, each particle consisting of copper having a thin film of copper oxide on its surface; b. consolidating said powder and particles to form a workpiece; and c. exposing said workpiece to microwave radiation in an inert atmosphere until a surface of said workpiece reaches a temperature of at least 500° C.
Claim 3
Dependent Claim
17 words
The method of claim 1, where said powder and particles are consolidated by applying pressure to them.
Claim 4
Dependent Claim
21 words
The method of claim 2, where said applied pressure has a value of about 10,000 to about 70,000 psi (68.9-482.6 MPa).
Claim 5
Dependent Claim
21 words
The method of claim 1, where said microwave radiation has a frequency of from about 500 MHz to about 500 GHz.
Claim 6
Dependent Claim
14 words
The method claim 4, where said microwave radiation has a frequency of 2.45 GHz.
Claim 7
Dependent Claim
23 words
The method of claim 6, where said microwave radiation is supplied at a power level of from about 50W to about 1 MW.
Claim 8
Independent Claim
16 words
The method of where said microwave radiation is supplied at a power level of about 700W.
Claim 9
Independent Claim
16 words
The method of where said microwave radiation is supplied at a power level of about 700W.
Claim 10
Dependent Claim
29 words
The method of claim 1, further characterized in that said workpiece is held at a temperature of at least 500° C. for about 1 minute to about 2 hours.
Claim 11
Dependent Claim
22 words
The method of claim 1, where particle sizes of said copper powder range from less than 1 micron to about 10 microns.
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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) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |