Patent US4287068A successfully refreshed from Google Patents.
US4287068A
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Powdered metal filter composition and processes for producing the same
Assignee: Hoeganaes Corp
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Filing: 1979-09-04
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Granted: 1981-09-01
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Expires: 1999-09-04
Abstract
Abstract A powdered metal filter composition and processes for producing the same by water atomization in which the composition exhibits an apparent density, compressibility and particle shape as a function of the composition chemistry and in particular the silicon, carbon and manganese content as well as the angle of intersection of the atomizing water jets; the composition providing an optimization of filtration efficiency, pressure drop across the filter pack, resistance to pressure deformation of the composition particles and the useful life of both the filter pack and the composition and the process producing such a composition with well-known apparatus and optimum yields of useful, particle-size fractions.
Inventors
- 👤 James G. Bewley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:54
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
48 words
A powdered metal filter composition consisting essentially of (a) a ferrous based alloy having by weight from approximately 0.60% to approximately 4.0% silicon; from approximately 0.05% to approximately 0.20% Carbon; and up to approximately 2.0% molybdenum; and exhibiting an apparent density of approximately 1.6 to 2.3 gr./cm. 3
Claim 2
Dependent Claim
48 words
A powdered metal filter composition consisting essentially of (a) a ferrous based alloy having by weight from approximately 0.60% to approximately 4.0% silicon; from approximately 0.05% to approximately 0.20% Carbon; and up to approximately 2.0% molybdenum; and exhibiting an apparent density of approximately 1.6 to 2.3 gr./cm. 3
Claim 3
Dependent Claim
22 words
A powdered metal filter composition in accordance with claim 1 exhibiting a compressability of from approximately 0.120 inches to approximately 0.160 inches.
Claim 4
Dependent Claim
22 words
A powdered metal filter composition in accordance with claims 1 or 2 having by weight from approximately 0.30% to approximately 1.0% manganese.
Claim 5
Dependent Claim
33 words
A powdered metal filter composition in accordance with claims 1 or 2 having by weight from approximately 2.0% to approximately 10% nickel; from approximately 16% to approximately 26% chromium with the balance iron.
Claim 6
Dependent Claim
24 words
A powdered metal filter composition in accordance with claim 4 having a particle size distribution of from approximately 50 to 100 mesh, U.S. Standard.
Claim 7
Dependent Claim
25 words
A powdered metal filter composition in accordance with claim 4 having a particle size distribution of from approximately 40 to approximately 80 mesh, U.S. Standard.
Claim 8
Dependent Claim
25 words
A powdered metal filter composition in accordance with claim 4 having a particle size distribution of from approximately 30 to approximately 60 mesh, U.S. Standard.
Claim 9
Dependent Claim
26 words
A powdered metal filter composition in accordance with claim 4 having a particle size distribution of from approximately 30 mesh to approximately 100 mesh, U.S. Standard.
Claim 10
Dependent Claim
47 words
A powdered metal filter composition in accordance with claim 4 in which the apparent density (ΔAD) varies as a function of the change in weight percent of the silicon content (ΔSi) and change in weight percent of the manganese content (ΔMn) in accordance with the equation ΔAD=(-1)(1.8)(ΔSi)+0.16(ΔMn).
Claim 11
Dependent Claim
60 words
A powdered metal filter composition consisting essentially of (a) a ferrous based alloy having by weight from approximately 0.06% to approximately 0.12% carbon; from approximately 0.50% to approximately 0.90% manganese; from approximately 2.0% to approximately 3.0% silicon; from approximately 4.0% to 7.0% nickel; from approximately 16% to approximately 18% chromium; and up to approximately 1% molybdenum, with the balance iron.
Claim 12
Dependent Claim
60 words
A powdered metal filter composition consisting essentially of (a) a ferrous based alloy having by weight from approximately 0.06% to approximately 0.12% carbon; from approximately 0.50% to approximately 0.90% manganese; from approximately 2.0% to approximately 3.0% silicon; from approximately 4.0% to 7.0% nickel; from approximately 16% to approximately 18% chromium; and up to approximately 1% molybdenum, with the balance iron.
Claim 13
Dependent Claim
46 words
A powdered metal filter composition consisting essentially of (a) a ferrous based alloy having by weight approximately 0.077% carbon; approximately 0.82% manganese; approximately 2.10% silicon; approximately 6.15% nickel; approximately 16.6% chromium; and approximately 0.39% molybdenum with the balance iron with traces of copper, tungsten and cobalt.
Claim 14
Dependent Claim
46 words
A powdered metal filter composition consisting essentially of (a) a ferrous based alloy having by weight approximately 0.077% carbon; approximately 0.82% manganese; approximately 2.10% silicon; approximately 6.15% nickel; approximately 16.6% chromium; and approximately 0.39% molybdenum with the balance iron with traces of copper, tungsten and cobalt.
Claim 15
Dependent Claim
19 words
A powdered metal filter composition in accordance with claim 11 exhibiting an apparent density of approximately 1.94 gr./cm. 3
Claim 16
Dependent Claim
19 words
A powdered metal filter composition in accordance with claims 11 or 12 having a compressability of approximately 0.146 inches.
Claim 17
Dependent Claim
26 words
A powdered metal filter composition in accordance with claim 13 having a particle size distribution of from approximately 30 mesh to approximately 100 mesh, U.S. Standard.
Claim 18
Dependent Claim
26 words
A powdered metal filter composition in accordance with claim 13 having a particle size distribution of from approximately 30 mesh to approximately 60 mesh, U.S. Standard.
Claim 19
Dependent Claim
26 words
A powdered metal filter composition in accordance with claim 13 having a particle size distribution of from approximately 40 mesh to approximately 80 mesh, U.S. Standard.
Claim 20
Dependent Claim
26 words
A powdered metal filter composition in accordance with claim 13 having a particle size distribution of from approximately 50 mesh to approximately 100 mesh, U.S. Standard.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |