Patent US4604141A successfully refreshed from Google Patents.
US4604141A
Expired / Lapsed
US
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Slip casting mold
Assignee: Hitachi Ltd
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Filing: 1984-04-12
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Granted: 1986-08-05
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Expires: 2004-04-12
Abstract
Abstract A slip casting mold consisting essentially of a gypsum mold, which contains a water-insoluble organic material, more particularly, a water-insoluble vegetable material such as cellulose, or which further contains glue in addition to the water-insoluble organic material. Since the strength of the casting mold is reduced markedly by heating, a cast article requiring a core (or master mold) having complex shape can be obtained extremely easily.
Inventors
- 👤 Tatsuo Natori
- 👤 Hideo Nakae
- 👤 Akihide Watanabe
- 👤 Takashi Shimaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:19
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/26; B28B1/261; B28B1/262; B28B1/264
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A slip casting mold consisting essentially of a gypsum mold, wherein said gypsum mold contains 2 to 20 parts by weight of a water-insoluble and water-absorbing vegetable cellulose and 0.05 to 2.00 parts by weight of impure gelatin, per 100 parts by weight of gypsum, whereby addition of the impure gelatin to the mold containing a water-insoluble and water-absorbing vegetable cellulose raises the initial strength of the mold while improving the collapsing property of the mold after heating at a temperature of at least 400° C.
Claim 2
Dependent Claim
86 words
A slip casting mold consisting essentially of a gypsum mold, wherein said gypsum mold contains 2 to 20 parts by weight of a water-insoluble and water-absorbing vegetable cellulose and 0.05 to 2.00 parts by weight of impure gelatin, per 100 parts by weight of gypsum, whereby addition of the impure gelatin to the mold containing a water-insoluble and water-absorbing vegetable cellulose raises the initial strength of the mold while improving the collapsing property of the mold after heating at a temperature of at least 400° C.
Claim 3
Dependent Claim
15 words
A slip casting mold as defined in claim 1 wherein said vegetable cellulose is paper.
Claim 4
Dependent Claim
23 words
A slip casting mold as defined in claim 1 wherein the water-insoluble and water-absorbing vegetable cellulose is in the form of a powder.
Claim 5
Dependent Claim
25 words
A slip casting mold as defined in claim 1 wherein 0.2 to 2.00 parts by weight of impure gelatin are contained in the gypsum mold.
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) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |