Patent US4915733A successfully refreshed from Google Patents.
US4915733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agglomerated metal composite powders
Assignee: H.C. Starck GmbH
•
Filing: 1989-01-19
•
Granted: 1990-04-10
•
Expires: 2009-01-19
Abstract
Abstract Metal powder agglomerates of individual particles comprising (i) more than 70% by weight of one or more metals selected from the group consisting of the elements molybdenum, rhenium and tungsten and (ii) one or more binder metals selected from the group consisting of iron, cobalt, nickel, copper, silver, gold, palladium, platinum, rhodium, chromium and rhenium, wherein the individual particles have grain sizes of less than 2 μm and all the metal particles lie side by side in uniform random distribution are useful as the powder required for producing shaped, sintered articles in a powder metallurgical preparation.
Inventors
- 👤 Heinz-Eckert Schutz
- 👤 Bernhard Szesny
- 👤 Bruno E. Krismer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:59
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/16; B01D1/18; B01J; B01J2/00; B01J2/02; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
Metal powder agglomerates of individual particles comprising (i) more than 70% by weight of one or more metals selected from the group consisting of the elements molybdenum, rhenium and tungsten and (ii) one or more binder metals selected from the group consisting of iron, cobalt, nickel, copper, silver, gold, palladium, platinum, rhodium, chromium and rhenium, wherein the individual particles have grain sizes of less than 2 μm and all the metal particles lie side by side in uniform random distribution, wherein both (i) and (ii) are not both rhenium.
Claim 2
Dependent Claim
89 words
Metal powder agglomerates of individual particles comprising (i) more than 70% by weight of one or more metals selected from the group consisting of the elements molybdenum, rhenium and tungsten and (ii) one or more binder metals selected from the group consisting of iron, cobalt, nickel, copper, silver, gold, palladium, platinum, rhodium, chromium and rhenium, wherein the individual particles have grain sizes of less than 2 μm and all the metal particles lie side by side in uniform random distribution, wherein both (i) and (ii) are not both rhenium.
Claim 3
Dependent Claim
40 words
Metal powder agglomerates according to claim 1, having an oxygen content of less than 1.5% by weight, with the grain size of the agglomerates less than 300 μm and the grain size of the individual particles less than 1 μm.
Claim 4
Dependent Claim
30 words
Metal powder agglomerates according to claim 2, wherein the grain size of the individual particles is less than 0.6 μm and the oxygen content is less than 1.0% by weight.
References Cited (Backward Citations)
US2431691A
Cited
GB732029A
Cited
US3418103A
Cited
FR2078508A5
Cited
US3652746A
Cited
US3663667A
Cited
US4216009A
Cited
US4384884A
Cited
EP0098944A2
Cited
US4498395A
Cited
US4613371A
Cited
US4584078A
Cited
US4678511A
Cited
US4775414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |