US5407458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine-particle metal powders
Assignee: H.C. Starck GmbH
•
Filing: 1993-04-26
•
Granted: 1995-04-18
•
Expires: 2013-04-26
Abstract
Abstract This invention relates to fine-particle powders of the metals B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and/or Cr which have a defined particle size of 1.0 nm to less than 3 μm. Less than 1% of the individual particles of the powder deviate by more than 40% from the average particle size, and no individual particle of the powder deviates by more than 60% from the average particle size.
Inventors
- 👤 Theo Konig
- 👤 Dietmar Fister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:20
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/28; B22F1/00; B22F1/05; B22F1/052; B22F1/14; B22F1/145; B22F2998/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
80 words
Fine-particle powders of at least one metal selected from the group consisting of B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and Cr wherein said powders have an average particle size of from 1.0 nm to less than 3 μm, further wherein less than 1% of the individual particles of said powder deviate by more than 40% from the average particle size and no individual particles of said powder deviate by more than 60% from the average particle size.
Claim 2
Dependent Claim
80 words
Fine-particle powders of at least one metal selected from the group consisting of B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and Cr wherein said powders have an average particle size of from 1.0 nm to less than 3 μm, further wherein less than 1% of the individual particles of said powder deviate by more than 40% from the average particle size and no individual particles of said powder deviate by more than 60% from the average particle size.
Claim 3
Dependent Claim
45 words
Metal powders as claimed in claim 1, wherein less than 1% of the individual particles of said powder deviate by more than 20% from the average particle size and no individual particles of said powder deviate by more than 50% from the average particle size.
Claim 4
Dependent Claim
45 words
Metal powders as claimed in claim 1, wherein less than 1% of the individual particles of said powder deviate by more than 10% from the average particle size and no individual particles of said powder deviate by more than 40% from the average particle size.
Claim 5
Dependent Claim
22 words
Metal powders as claimed in claim 1, wherein the particle size is in the range from 1 to less than 500 nm.
Claim 6
Dependent Claim
26 words
Metal powders as claimed in one or more of claim 1, wherein the particle size is in the range from 1 to less than 100 nm.
Claim 7
Dependent Claim
19 words
Metal powders as claimed in claim 1, wherein the powders have an oxygen content of less than 5,000 ppm.
Claim 8
Dependent Claim
19 words
Metal powders as claimed in claim 1, wherein the powders have an oxygen content of less than 1,000 ppm.
Claim 9
Dependent Claim
18 words
Metal powders as claimed claim 1, wherein the powders have an oxygen content of less than 100 ppm.
Claim 10
Dependent Claim
22 words
Metal powders as claimed in claim 1, wherein the sum total of impurities, except for oxidic impurities, is less than 5000 ppm.
Claim 11
Dependent Claim
22 words
Metal powders as claimed in claim 1, wherein the sum total of impurities, except for oxidic impurities, is less than 1000 ppm.
Claim 12
Dependent Claim
22 words
Metal powders as claimed in claim 1, wherein the sum total of impurities, except for oxidic impurities, is less than 200 ppm.
Claim 13
Dependent Claim
15 words
Metal powders as claimed in claim 1, comprising a quantity of more than 1 kg.
Claim 14
Dependent Claim
22 words
Metal powders as claimed in claim 1, wherein the particle size is in the range from 1 to less than 50 nm.
Claim 15
Dependent Claim
19 words
Metal powders as claimed in claim 1, wherein the powders have an oxygen content of less than 50 ppm.
Claim 16
Dependent Claim
80 words
Fine-particle powders of at least one metal selected from the group consisting of B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and Cr wherein said powders have an average particle size of from 1.0 nm to less than 500 nm, further wherein less than 1% of the individual particles of said powder deviate by more than 40% from the average particle size and no individual particles of said powder deviate by more than 60% from the average particle size.
Claim 17
Dependent Claim
80 words
Fine-particle powders of at least one metal selected from the group consisting of B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and Cr wherein said powders have an average particle size of from 1.0 nm to less than 500 nm, further wherein less than 1% of the individual particles of said powder deviate by more than 40% from the average particle size and no individual particles of said powder deviate by more than 60% from the average particle size.
Claim 18
Dependent Claim
45 words
Metal powders as claimed in claim 15, wherein less than 1% of the individual particles of said powder deviate by more than 20% from the average particle size and no individual particles of said powder deviate by more than 50% from the average particle size.
Claim 19
Dependent Claim
22 words
Metal powders as claimed in claim 16, wherein the particle size is in the range from 1 to less than 50 nm.
Claim 20
Dependent Claim
80 words
Fine-particle powders of at least one metal selected from the group consisting of B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and Cr wherein said powders have an average particle size of from 1.0 nm to less than 100 nm, further wherein less than 1% of the individual particles of said powder deviate by more than 40% from the average particle size and no individual particles of said powder deviate by more than 60% from the average particle size.
Claim 21
Dependent Claim
80 words
Fine-particle powders of at least one metal selected from the group consisting of B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and Cr wherein said powders have an average particle size of from 1.0 nm to less than 100 nm, further wherein less than 1% of the individual particles of said powder deviate by more than 40% from the average particle size and no individual particles of said powder deviate by more than 60% from the average particle size.
Claim 22
Dependent Claim
45 words
Metal powders as claimed in claim 18, wherein less than 1% of the individual particles of said powder deviate by more than 20% from the average particle size and no individual particles of said powder deviate by more than 50% from the average particle size.
Claim 23
Dependent Claim
22 words
Metal powders as claimed in claim 19, wherein the particle size is in the range from 1 to less than 50 nm.
References Cited (Backward Citations)
GB919954A
Cited
GB950148A
Cited
US4383852A
Cited
US4584078A
Cited
US4994107A
Cited
US4740238A
Cited
EP0290177A1
Cited
US4769064A
Cited
US4954169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |