US4552719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sintering stainless steel powder
Assignee: NDC Co Ltd
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Filing: 1983-08-31
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Granted: 1985-11-12
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Expires: 2003-08-31
Abstract
Abstract A stainless steel powder is mixed with at least a Ni--Mn and a Ni--Cr powder, and the powder mixture is formed by loose packing into a required configuration. The powder mixture is sintered in a non-oxidizing atmosphere at the melting point of the Ni--Mn powder or at a higher temperature thereby to obtain a porous body.
Inventors
- 👤 Toru Morimoto
- 👤 Tsuyoshi Ohsaki
- 👤 Toshio Ohkawa
- 👤 Masahito Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:55
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A method for manufacturing a porous sintered stainless steel body comprising the steps of: (a) forming a mixture comprising stainless steel powder, Ni-Mn powder and Ni-Cr powder, wherein the particles of the Ni-Mn powder and the Ni-Cr powder are smaller than the particles of said stainless steel powder; (b) pouring the resulting powder mixture of step (a) into a heat-proof vessel without applying any pressure to said mixture; (c) sintering said mixture poured into said heat-proof vessel of step (b) under a non-oxidizing atmosphere without applying any pressure to said mixture such that said sintering is started at about at least 1000° C. with the temperature gradually being raised and said sintering is finished at 1200° C. to 1350° C.
Claim 2
Independent Claim
120 words
A method for manufacturing a porous sintered stainless steel body comprising the steps of: (a) forming a mixture comprising stainless steel powder, Ni-Mn powder and Ni-Cr powder, wherein the particles of the Ni-Mn powder and the Ni-Cr powder are smaller than the particles of said stainless steel powder; (b) pouring the resulting powder mixture of step (a) into a heat-proof vessel without applying any pressure to said mixture; (c) sintering said mixture poured into said heat-proof vessel of step (b) under a non-oxidizing atmosphere without applying any pressure to said mixture such that said sintering is started at about at least 1000° C. with the temperature gradually being raised and said sintering is finished at 1200° C. to 1350° C.
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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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |