US4921665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing powder metal parts with dynamic properties
Assignee: SCM Metal Products Inc
•
Filing: 1988-03-11
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Granted: 1990-05-01
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Expires: 2008-03-11
Abstract
Abstract The present invention relates to porous powder metal (P/M) parts having improved dynamic properties such as impact and fatigue strength. These properties are achieved by the use of finer metal powders.
Inventors
- 👤 Erhard Klar
- 👤 Mark Svilar
- 👤 David F. Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:22
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0242
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A process of manufacturing powder metal parts by powder metallurgical technique, comprising the use of iron powders having a particle size small enough to pass through a 140 U.S. mesh screen whereby said metal parts have improved impact and fatigue strength.
Claim 2
Dependent Claim
41 words
A process of manufacturing powder metal parts by powder metallurgical technique, comprising the use of iron powders having a particle size small enough to pass through a 140 U.S. mesh screen whereby said metal parts have improved impact and fatigue strength.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the powder metal parts are made from a binder-treated powder.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the powder metal parts are made from infiltrated steels.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the powder metal parts are made from low alloy steels.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the powder metal parts are made from stainless steels.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the powder metal parts are made from tool steels.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the powder metal parts are copper-infiltrated.
References Cited (Backward Citations)
US3425828A
Cited
US3720551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |