Patent US4923652A successfully refreshed from Google Patents.
US4923652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing binder from powder molded products
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1987-07-01
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Granted: 1990-05-08
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Expires: 2007-07-01
Abstract
Abstract A method of vaporizing and removing a binder from a powder-molded product containing the binder, which method comprises: coating the greater part of the surface of said powder-molded product with a thin resin film having air-tightness thereby leasing an exposed surface portion; pressurizing the thus-coated surface portion of the pressure-molded product hydrostatically; vaporizing the binder in the power-molded product under said hydrostatic pressurization; and removing the vaporized binder to the exterior of the power-molded product through said exposed surface portion not coated with the thin film.
Inventors
- 👤 Norihiro Murakawa
- 👤 Hisashi Isomura
- 👤 Kazukiyo Miura
- 👤 Shinichi Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:43
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/626; C04B35/63; C04B35/638
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A method of vaporizing and removing a binder from a powder-molded product containing a binder, which method comprises: coating all but 0.5% to 20% of the total surface area of said powder-molded product with an airtight thin resin film thereby leaving an exposed surface portion hydrostatically pressurizing the thus-coated surface portion of the pressure molded product; vaporizing the binder in the powder-molded product under said hydrostatic pressurization; and removing the vaporizing binder from the powder-molded product through said exposed surface portion not coated with the thin film.
Claim 2
Independent Claim
87 words
A method of vaporizing and removing a binder from a powder-molded product containing a binder, which method comprises: coating all but 0.5% to 20% of the total surface area of said powder-molded product with an airtight thin resin film thereby leaving an exposed surface portion hydrostatically pressurizing the thus-coated surface portion of the pressure molded product; vaporizing the binder in the powder-molded product under said hydrostatic pressurization; and removing the vaporizing binder from the powder-molded product through said exposed surface portion not coated with the thin film.
Claim 3
Dependent Claim
38 words
A method as set forth in claim 1 wherein said vaporization of the binder of the powder-molded product occurs by heating the powder-molded product and removing said vaporized binder from the powder-molded product through said exposed surface portion.
Claim 4
Dependent Claim
37 words
A method as set forth in claim 1, wherein the powder-molded product is subjected to vacuum suction-deaeration through said exposed surface portion to vaporize and remove said binder from the powder-molded product through said exposed surface portion.
Claim 5
Dependent Claim
43 words
A method as set forth in claim 1, wherein the powder-molded product is heated and at the same time subjected to vacuum suction-deaeration through said exposed surface portion to vaporize and remove said binder from the powder-molded product through said exposed surface portion.
Claim 6
Dependent Claim
17 words
A method as set forth in claim 1, wherein the powder-molded product is formed by injection molding.
Claim 7
Dependent Claim
17 words
A method as set forth in claim 1, wherein the powder-molded product is formed by slip casting.
Claim 8
Dependent Claim
15 words
A method as set forth in claim 1, wherein the powder is a ceramic powder.
Claim 9
Independent Claim
30 words
A method as set forth in any one of claims 1 to 7, wherein the powder-molded product after removal of the binder is subsequently ignited into a sintered ceramic product.
Claim 10
Dependent Claim
36 words
A method as set forth in claim 1 wherein said exposed surface portion of said powdered-molded product, uncovered with said thin resin film, represents 1% to 10% of the total surface area of said powder-molded product.
References Cited (Backward Citations)
US4248813A
Cited
US4248813B1
Cited
JPS59198105A
Cited
US4612146A
Cited
US4647414A
Cited
US4696777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |