US4248813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high density sintered products
Assignee: Niterra Co Ltd
•
Filing: 1979-07-25
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Granted: 1981-02-03
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Expires: 1999-07-25
Abstract
Abstract A process for producing high density sintered product which comprises molding a composite of an inorganic powder and an organic resin, burning off the organic resin, coating the surface of the molding with a rubber film, pressing said moldings under 2 ton/cm2 or more of isostatic pressure, and sintering.
Inventors
- 👤 Yoshinori Hattori
- 👤 Mitsuyoshi Kawamura
- 👤 Yasushi Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:56
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/22; B22F3/225; B22F3/10; B22F3/1017; B22F3/12; B22F3/1208; B22F3/1216; B22F3/1233; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/591; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63408; C04B35/63424; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; B22F2998/00; B22F2998/10; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
In a process for producing a high density sintered product which comprises molding a composite of an inorganic powder and organic resin, burning off the organic resin and sintering, the improvement which comprises after burning off the organic resin, coating the surface of the molding with a rubber film, pressing said molding under two ton/cm 2 or more of isostatic pressure, and then carrying out said sintering step.
Claim 2
Dependent Claim
68 words
In a process for producing a high density sintered product which comprises molding a composite of an inorganic powder and organic resin, burning off the organic resin and sintering, the improvement which comprises after burning off the organic resin, coating the surface of the molding with a rubber film, pressing said molding under two ton/cm 2 or more of isostatic pressure, and then carrying out said sintering step.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein molding is carried out by either die press molding or injection molding.
Claim 4
Dependent Claim
16 words
The process of claims 1 or 2, wherein said rubber film is composed of latex rubber.
Claim 5
Dependent Claim
16 words
The process of claim 1, wherein the sintered product is a rotor of a turbine engine.
Claim 6
Dependent Claim
17 words
The process of claim 1, wherein the sintered product is an L-shaped insulating tube for aircraft ignitors.
Claim 7
Dependent Claim
28 words
The process of claims 1, 2 or 3, wherein the inorganic powder is a metallic silicon powder and the sintering is carried out in a nitrogen containing atmosphere.
Claim 8
Dependent Claim
17 words
The process of claim 1, wherein the resin is burnt off at about 200° to 800° C.
References Cited (Backward Citations)
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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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |