Patent US5320800A successfully refreshed from Google Patents.
US5320800A
Expired / Lapsed
US
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Nanocrystalline ceramic materials
Assignee: Arch Development Corp
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Filing: 1993-06-30
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Granted: 1994-06-14
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Expires: 2013-06-30
Abstract
Abstract A method for preparing a treated nanocrystalline metallic material. The method of preparation includes providing a starting nanocrystalline metallic material with a grain size less than about 35 nm, compacting the starting nanocrystalline metallic material in an inert atmosphere and annealing the compacted metallic material at a temperature less than about one-half the melting point of the metallic material.
Inventors
- 👤 Richard W. Siegel
- 👤 G. William Nieman
- 👤 Julia R. Weertman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:44
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/006; B22; B22F; B22F3/00; B22F3/006; B22F9/00; B22F9/02; B22F9/12; B82; B82Y; B82Y30/00; C; C01; C01B; C01B13/00; C01B13/14; C01B13/32; C01B13/322; C01B33/00; C01B33/02; C01F; C01F5/00; C01F5/02; C01F5/04; C01F7/00; C01F7/02; C01F7/42; C01F7/422; C01F7/424; C01G; C01G23/00; C01G23/04; C01G23/047; C01G9/00; C01G9/02; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/21
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A method of preparing a treated nanocrystalline metallic material, comprising the steps of: providing a starting nanocrystalline metallic material having a mean grain size less than about 35 nm; compacting said starting nanocrystalline metallic material in a selected inert atmosphere, said compacted metallic material having the mean grain size less than about 35 nm; and annealing said compacted metallic material at a temperature less than about one-half of the melting point of said metallic material.
Claim 2
Independent Claim
75 words
A method of preparing a treated nanocrystalline metallic material, comprising the steps of: providing a starting nanocrystalline metallic material having a mean grain size less than about 35 nm; compacting said starting nanocrystalline metallic material in a selected inert atmosphere, said compacted metallic material having the mean grain size less than about 35 nm; and annealing said compacted metallic material at a temperature less than about one-half of the melting point of said metallic material.
Claim 3
Dependent Claim
27 words
The method as defined in claim 1 wherein said nanocrystalline metallic material is selected from the group consisting essentially of noble metals, transition metals and mixtures thereof.
Claim 4
Dependent Claim
19 words
The method as defined in claim 2 wherein said nanocrystalline metallic material further includes silicon as an additive thereto.
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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) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |