US3707152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting parts having dimensionally critical apertures
Assignee: Ormco Corp
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Filing: 1971-01-18
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Granted: 1972-12-26
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Expires: 1991-01-18
Abstract
Abstract A process for making a product having a dimensionally critical aperture extending therethrough comprises placing a sized elongated pin in a predetermined position through a mold cavity. A body is cast in the mold cavity for use in a lost-wax process. The body is then reproduced in metal by the lost-wax process. The pin is carried along with the cast body so that the body constructed in metal bears the pin at the location of the intended aperture. The pin is thereafter dissolved from the metal body.
Inventors
- 👤 George R Arnold
- 👤 Raymond S Rosiello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02; A; A61; A61C; A61C7/00; A61C7/12; A61C7/28; A61C7/282
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
213 words
A process of making a product having a dimensionally critical aperture extending therethrough comprising: placing an elongated pin in a predetermined position through a cavity of a mold, the mold cavity being so sized and shaped to closely match the size and shape of the product to be made, the pin being so sized and shaped to closely match the size and shape of the intended aperture, the pin being positioned in the mold cavity in the location closely matching that of the intended aperture; supplying a liquid substance into the cavity completely filling the cavity; permitting the liquid substance to become solid about the pin; physically removing the solidified substance and the pin from the mold cavity; encasing in a snug fitting manner the solidified substance with a thin layer of sheet material; removing the solidified substance from within the layer of sheet material; supplying a liquid metal within the layer of sheet material; maintaining the temperature of the liquid metal below the temperature at which would result in melting of the elongated pin; causing the liquid metal to become solid; physically removing the layer of solid material from around the solidified metal; and removing the elongated pin thereby resulting in the forming of the dimensionally critical aperture within the molded product.
Claim 2
Dependent Claim
213 words
A process of making a product having a dimensionally critical aperture extending therethrough comprising: placing an elongated pin in a predetermined position through a cavity of a mold, the mold cavity being so sized and shaped to closely match the size and shape of the product to be made, the pin being so sized and shaped to closely match the size and shape of the intended aperture, the pin being positioned in the mold cavity in the location closely matching that of the intended aperture; supplying a liquid substance into the cavity completely filling the cavity; permitting the liquid substance to become solid about the pin; physically removing the solidified substance and the pin from the mold cavity; encasing in a snug fitting manner the solidified substance with a thin layer of sheet material; removing the solidified substance from within the layer of sheet material; supplying a liquid metal within the layer of sheet material; maintaining the temperature of the liquid metal below the temperature at which would result in melting of the elongated pin; causing the liquid metal to become solid; physically removing the layer of solid material from around the solidified metal; and removing the elongated pin thereby resulting in the forming of the dimensionally critical aperture within the molded product.
Claim 3
Dependent Claim
42 words
The method as defined in claim 1 wherein the pin is constructed of a material to withstand high temperatures while yet being readily susceptible to being dissolved chemically, the step of removing the elongated pin is accomplished by dissolving the pin chemically.
Claim 4
Dependent Claim
58 words
The method as defined in claim 1 wherein the liquid substance supplied within the mold cavity comprises heated wax, after the wax had been solidified the removing of the solidified wax from within the layer of solid material is accomplished by reheating the wax causing such to become liquid and pour from within the layer of solid material.
Claim 5
Dependent Claim
32 words
The method as defined in claim 3 wherein the melting of the wax to permit such to be removed from within the layer of solid material is accomplished in an inert atmosphere.
Claim 6
Dependent Claim
37 words
The method as defined in claim 1 wherein the step of encasing is accomplished by applying a pliable ceramic about the solidified substance, baking the pliable ceramic to cause such to assume the layer of sheet material.
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |