US4601877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press sintering process for green compacts and apparatus therefor
Assignee: Dow Chemical Co
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Filing: 1985-07-23
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Granted: 1986-07-22
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Expires: 2005-07-23
Abstract
Abstract A green compact (17) preheated to a predetermined temperature in a heating furnace (16) is inserted into a container comprising a press table (20) and a hollow cylinder (25), and molten glass (33) is then placed into the container. The green compact (17) is uniformly pressed by a press rod (29) through the molten glass (33). The molten glass (33) is cooled by a coolant flowing through channels (22) and (26) formed in the press table (20) and the cylinder (25), whereby a solidified shell (34) is formed at the outer peripheral portion of the mass of glass. Finally, the shell (34) is taken out from the container, and the molten portion of glass (33) is transferred into a ladle (31) through a grating (30), leaving the compressed sintered product on the grating (30).
Inventors
- 👤 Tadaomi Fujii
- 👤 Koji Kitazawa
- 👤 Yutaka Tomono
- 👤 Tomio Takagi
- 👤 Josuke Kawachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:46
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; B30; B30B; B30B5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A press sintering process for a green compact comprising inserting the green compact into a pressing container after preheating the green compact to a predetermined temperature, placing into the container a solidifiable pressure medium previously melted by heating, applying a mechanical pressing force to the green compact within the container solely through the pressure medium, the pressing force being produced by mechanical press means adapted to be in direct contact with the pressure medium, positively cooling the container to solidify the outer peripheral portion of the pressure medium and form a solidified shell, taking out from the container the solidified shell containing the sintered green compact and some pressure medium in the molten state, and taking out the compressed sintered product from the solidified shell.
Claim 2
Dependent Claim
125 words
A press sintering process for a green compact comprising inserting the green compact into a pressing container after preheating the green compact to a predetermined temperature, placing into the container a solidifiable pressure medium previously melted by heating, applying a mechanical pressing force to the green compact within the container solely through the pressure medium, the pressing force being produced by mechanical press means adapted to be in direct contact with the pressure medium, positively cooling the container to solidify the outer peripheral portion of the pressure medium and form a solidified shell, taking out from the container the solidified shell containing the sintered green compact and some pressure medium in the molten state, and taking out the compressed sintered product from the solidified shell.
Claim 3
Dependent Claim
32 words
A process as defined in claim 1 wherein the sintered product is taken out by transferring the molten portion of the pressure medium from the shell into a ladle through a grating.
Claim 4
Dependent Claim
17 words
A process as defined in claim 1 wherein the pressure medium is molten glass or molten metal.
Claim 5
Dependent Claim
75 words
A press sintering apparatus for green compacts comprising a pressing container including a movable cylinder with a central through bore and a stationary press table fitting in the central bore of the cylinder from one end thereof and slidable in sealing contact with the cylinder, a press rod insertable into the central bore of the cylinder from the other end thereof in sealing contact with the cylinder, and coolant channel means embedded in the container.
Claim 6
Dependent Claim
75 words
A press sintering apparatus for green compacts comprising a pressing container including a movable cylinder with a central through bore and a stationary press table fitting in the central bore of the cylinder from one end thereof and slidable in sealing contact with the cylinder, a press rod insertable into the central bore of the cylinder from the other end thereof in sealing contact with the cylinder, and coolant channel means embedded in the container.
Claim 7
Dependent Claim
20 words
An apparatus as defined in claim 4 further comprising retaining means for supporting the green compact above the press table.
Claim 8
Dependent Claim
15 words
An apparatus as defined in claim 5 wherein the retaining means is a coil jig.
Claim 9
Dependent Claim
48 words
An apparatus as defined in claim 4 wherein the cylinder comprises an inner peripheral portion and an outer peripheral portion, and a spiral coolant channel communicating with a coolant supply channel and a coolant discharge channel is provided between the inner peripheral portion and the outer peripheral portion.
Claim 10
Dependent Claim
46 words
An apparatus as defined in claim 4 wherein the press table comprises an upper portion and a lower portion, and a coolant channel communicating with a coolant supply channel and a coolant discharge channel is provided between the upper table portion and the lower table portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |