Patent US4591470A successfully refreshed from Google Patents.
US4591470A
Expired / Lapsed
US
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Process for preparing structural bodies of granular material
Assignee: Namba Press Works Co Ltd
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Filing: 1983-10-04
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Granted: 1986-05-27
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Expires: 2003-10-04
Abstract
Abstract A process for molding a structural body of ceramic or other granular materials which has hollow portions inwardly enlarged or complicatedly configured, which process comprises preparing a removable insert member which is fusible at temperatures not affecting an unbaked structural body and has the contours corresponding to an intended hollow portion, molding a structural body with ceramic or other granular material integrally with the removable insert member as by injection or transfer molding, heating as by electricity or hot fluids the insert member to cause the latter to be fused and formed with a through hole extending from end to end of the member, and blowing hot air into the through hole during a preliminary baking of the unbaked structural body so as to completely remove the insert member thereby to obtain a molded structural body of granular material provided with complicated hollow portions therein.
Inventors
- 👤 Fumio Goto
- 👤 Taro Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; B; B22; B22F; B22F5/00; B22F5/10; B28; B28B; B28B7/00; B28B7/34; B28B7/342; C04B35/63492; C04B35/63496; C04B35/638; C04B38/00; C04B38/06; C04B38/061; B22F2005/103; B29; B29L; B29L2023/00; C04B2235/00; C04B2235/60; C04B2235/602; C04B2235/6028
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
151 words
A process for molding a structural body of granular material having hollow portions of complicated configurations, comprising: (a) making a removable insert member of the contours corresponding to said hollow portions from materials capable of being fused at temperatures at which no undesirable influences occur to an unbaked structural body, (b) placing said insert member in a mold and molding the structural body of granular material integrally with said removable insert member, (c) fusing the material of said insert member at least in the area surrounding the longitudinal axis thereof to form a through hole extending axially from end to end of said member, (d) blowing air into said through hole substantially at temperatures for a preliminary baking of said unbaked structural body and for removing substantially all of said insert member without affecting said structural body, and (e) subjecting said structural body to a final baking at much higher temperatures.
Claim 2
Dependent Claim
151 words
A process for molding a structural body of granular material having hollow portions of complicated configurations, comprising: (a) making a removable insert member of the contours corresponding to said hollow portions from materials capable of being fused at temperatures at which no undesirable influences occur to an unbaked structural body, (b) placing said insert member in a mold and molding the structural body of granular material integrally with said removable insert member, (c) fusing the material of said insert member at least in the area surrounding the longitudinal axis thereof to form a through hole extending axially from end to end of said member, (d) blowing air into said through hole substantially at temperatures for a preliminary baking of said unbaked structural body and for removing substantially all of said insert member without affecting said structural body, and (e) subjecting said structural body to a final baking at much higher temperatures.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 wherein electrical heating by a wire embedded in said insert member is used for forming said through hole.
Claim 4
Dependent Claim
37 words
A process as claimed in claim 2 wherein, prior to said preliminary baking, electrical current is passed through said embedded wire to generate heat and fuse the material of said insert member to form said through hole.
Claim 5
Dependent Claim
35 words
A process as claimed in claim 1 including contacting said insert member with a hot fluid which does not affect said unbaked structural body but which fuses said insert member for forming said through hole.
Claim 6
Dependent Claim
31 words
A process as claimed in claim 4 wherein the hot fluid is a hot oil which is sprayed onto the ends of said insert member molded integrally with the structural body.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 4 including providing said insert member with indentations at its ends.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 6 wherein the hot fluid is a hot oil which is sprayed onto the indentations of said insert member molded integrally with the structural body.
Claim 9
Dependent Claim
16 words
A process as claimed in claim 1 wherein said insert member is made from organic materials.
Claim 10
Dependent Claim
16 words
A process as claimed in claim 8 wherein said organic materials are thermoplastic or thermosetting plastics.
Claim 11
Dependent Claim
16 words
A process as claimed in claim 1 wherein said insert member is made from inorganic materials.
Claim 12
Dependent Claim
18 words
A process as claimed in claim 10 wherein said inorganic materials are mixtures of alkali nitrates and nitrites.
Claim 13
Dependent Claim
18 words
A process as claimed in claim 1 wherein said insert member is made from organic and inorganic materials.
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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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |