US3713193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory powder hot-pressing system
Assignee: Panasonic Holdings Corp
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Filing: 1970-10-12
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Granted: 1973-01-30
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Expires: 1990-10-12
Abstract
Abstract A system for hot-pressing refractory powders into dense sintered bodies comprises a tunnel type furnace having a given temperature distribution therein, a plurality of die assemblies each of which has a refractory powder sandwiched between an upper punch and a lower punch thereof, a plurality of supporters for said plurality of dies. At least one pressing means is positioned at a given position in the tunnel type furnace to be at a given temperature. Means are provided for conveying said supporters intermittently one by one from an inlet of said tunnel type furnace through said at least one pressing means to an outlet of said tunnel type furnace, whereby the refractory powder in each of said die assemblies is hot-pressed into a dense sintered body by said at least one pressing means and the dense sintered bodies are conveyed to said outlet. The equipment is suitable for massproduction of hot-pressed bodies of materials such as ferrites and ferroelectric oxides.
Inventors
- 👤 H Chiba
- 👤 H Masuda
- 👤 E Hirota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:56
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32; C04B33/326; B; B28; B28B; B28B3/00; B28B3/02; B28B3/025; C04B35/00; C04B35/01; C04B35/26; C04B35/2658; C04B35/622; C04B35/64; C04B35/645; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3262; C04B2235/3284; C04B2235/65; C04B2235/66; C04B2235/661; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/78; C04B2235/786
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
A system for hot-pressing refractory powders into dense sintered bodies, said system comprising a tunnel type furnace having an inlet and an outlet and a given temperature distribution therein; a plurality of die assemblies, each of which has said refractory powders sandwiched between an upper punch thereof; a plurality of supporters for said plurality of die assemblies, each of said plurality of supporters having a refractory plate at the top thereof in order to prevent the bottom of said supporter from being heated and having a refractory plunger movably inserted in a guide thereof and extending through anD abutting the top surface of said refractory plate, whereby a pressing force from said pressing means is transferred through said plunger to said lower punch; at least one pressing means which is positioned at a given position having a predetermined temperature within said tunnel type furnace; means for conveying said supporters intermittently one by one from said inlet, through said at least one pressing means to said outlet; whereby said refractory powders in each of said die assemblies are hot-pressed into a dense sintered body by said at least one pressing means and said dense sintered body is conveyed to said outlet.
Claim 2
Independent Claim
200 words
A system for hot-pressing refractory powders into dense sintered bodies, said system comprising a tunnel type furnace having an inlet and an outlet and a given temperature distribution therein; a plurality of die assemblies, each of which has said refractory powders sandwiched between an upper punch thereof; a plurality of supporters for said plurality of die assemblies, each of said plurality of supporters having a refractory plate at the top thereof in order to prevent the bottom of said supporter from being heated and having a refractory plunger movably inserted in a guide thereof and extending through anD abutting the top surface of said refractory plate, whereby a pressing force from said pressing means is transferred through said plunger to said lower punch; at least one pressing means which is positioned at a given position having a predetermined temperature within said tunnel type furnace; means for conveying said supporters intermittently one by one from said inlet, through said at least one pressing means to said outlet; whereby said refractory powders in each of said die assemblies are hot-pressed into a dense sintered body by said at least one pressing means and said dense sintered body is conveyed to said outlet.
Claim 3
Dependent Claim
51 words
A system as claimed in claim 1, wherein said plurality of supporters are substantially equal in length to each other along the path of travel through said furnace, and each of said supporters is conveyed intermittently by a distance substantially equal to n-times said length, n being an integer including one.
Claim 4
Dependent Claim
54 words
A system as claimed in claim 2, wherein said tunnel type furnace is divided into a plurality of rooms by insulating walls, each of which has a cut-off to allow said die assemblies on said supporters to pass therethrough, said plurality of room having a length substantially similar to said length of said supporters.
Claim 5
Independent Claim
116 words
A system for hot-pressing refractory powders into dense sintered bodies, said system comprising a tunnel type furnace having an inlet and an outlet and a given distribution of different temperature zones therein; a plurality of die assemblies, each of which has said refractory powders sandwiched between an upper punch and a lower punch thereof; a plurality of supporters for said plurality of die assemblies; at least one pressing means which is positioned at a given position having a predetermined temperature within said tunnel type furnace, said at least one pressing means comprising a first pressing device and a second pressing device, said first and second pressing devices being positioned within different temperature zones of said furnace.
Claim 6
Independent Claim
116 words
A system for hot-pressing refractory powders into dense sintered bodies, said system comprising a tunnel type furnace having an inlet and an outlet and a given distribution of different temperature zones therein; a plurality of die assemblies, each of which has said refractory powders sandwiched between an upper punch and a lower punch thereof; a plurality of supporters for said plurality of die assemblies; at least one pressing means which is positioned at a given position having a predetermined temperature within said tunnel type furnace, said at least one pressing means comprising a first pressing device and a second pressing device, said first and second pressing devices being positioned within different temperature zones of said furnace.
Claim 7
Dependent Claim
37 words
A system as claimed in claim 4, wherein each of said pressing devices have upper stationary cylinders, said upper stationary cylinder of said first pressing device being positioned at a lower level than said second pressing device.
Claim 8
Dependent Claim
33 words
A system as claimed in claim 1, wherein said refractory plunger comprises two blocks, one of which is made of refractory material and the other of which is made of heat resistance material.
Claim 9
Dependent Claim
78 words
A system as claimed in claim 1, wherein each of said die assemblies includes a die, and further comprising a holder positioned on said top surface of each of said refractory plates, said holder having a hole formed at the center thereof, said die being positioned on said holder, whereby said lower punch and the top portion of said plunger move upwardly through said hole without moving said die upon application of pressure force from said pressing means.
References Cited (Backward Citations)
DE516858C
Cited
US1524362A
Cited
US2125588A
Cited
US3309186A
Cited
US3303533A
Cited
US3557414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |