US4932099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing reinforced composite materials
Assignee: Old Carco LLC
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Filing: 1988-10-17
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Granted: 1990-06-12
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Expires: 2008-10-17
Abstract
Abstract A method is disclosed for producing a reinforced composite material. A molten matrix metal is heated to a temperature substantially greater than the melting point of the matrix metal. The matrix metal is poured into a mold containing a mass of reinforcing material. The matrix metal is solidified.
Inventors
- 👤 John M. Corwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:10
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/14; C; C22; C22C; C22C47/00; C22C47/08; C22C49/00; C22C49/02; C22C49/04; C22C49/06; F; F16; F16C; F16C7/00; F16C7/02; F16C7/023; F16D; F16D65/00; F16D65/02; F16D65/12; F16D65/125; B22F; B22F2998/00; B22F2998/10; F16D55/00; F16D2055/0004; F16D2055/0016; F16D2250/00; F16D2250/0007; F16D2250/0015
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A method of producing an alumina-reinforced composite material, said method comprising the steps of: (a) using a preformed body containing alumina to form an investment casting mold; (b) evacuating a chamber for melting to a chamber pressure of about 0.10 to about 0.25 mm Hg; (c) heating said mold to a temperature of about 1,800° F. to about 2,200° F.; (d) melting an aluminum alloy containing about 3.5% Mg; (e) heating said alloy to a temperature of about 1,800° F. to about 2,200° F. while maintaining the alloy at a pressure of about 0.76 mm Hg; (f) pouring said molten aluminum alloy into said casting mold which contains alumina from said preformed body; (g) increasing said chamber pressure to a pressure in the range of 760 to 1500 mm Hg; and (h) solidifying said molten aluminum alloy.
Claim 2
Independent Claim
137 words
A method of producing an alumina-reinforced composite material, said method comprising the steps of: (a) using a preformed body containing alumina to form an investment casting mold; (b) evacuating a chamber for melting to a chamber pressure of about 0.10 to about 0.25 mm Hg; (c) heating said mold to a temperature of about 1,800° F. to about 2,200° F.; (d) melting an aluminum alloy containing about 3.5% Mg; (e) heating said alloy to a temperature of about 1,800° F. to about 2,200° F. while maintaining the alloy at a pressure of about 0.76 mm Hg; (f) pouring said molten aluminum alloy into said casting mold which contains alumina from said preformed body; (g) increasing said chamber pressure to a pressure in the range of 760 to 1500 mm Hg; and (h) solidifying said molten aluminum alloy.
Claim 3
Dependent Claim
62 words
A method according to claim 1 wherein step (a) comprises: (1) using a preformed body containing a mass of alumina fiber joined together by wax as a pattern to form an investment casting mold; and (2) removing said wax from said mold by heating said fiber and mold to a temperature in the range of about 400° F. to about 1,800° F.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein said preformed body is a foam preform.
Claim 5
Dependent Claim
16 words
A method according to claim 1 wherein said preformed body is a chopped fiber mat preform.
Claim 6
Dependent Claim
22 words
A method according to claim 1 wherein said alloy is heated to a temperature of about 1,900° F. to about 2,050° F.
Claim 7
Dependent Claim
22 words
A method according to claim 5 wherein said mold is heated to a temperature of about 1,900° F. to about 2,050° F.
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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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |