US3581802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making castings
Assignee: Saint Gobain Isover G+H AG
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Filing: 1969-01-31
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Granted: 1971-06-01
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Expires: 1989-01-31
Abstract
Abstract A method and apparatus for making castings. A body of granular material is confined in a container and a stream of gaseous fluid is introduced into the bottom of the container to impart to the granular material a state at least approaching fluidization. Into the thus agitated granular material a form is introduced consisting of a material which is subject to consumption on contact with a molten metal. Admission of gaseous fluid is terminated to permit settling and compacting of the granular material about the form. Molten metal is introduced into the form to assume the configuration of the same while simultaneously consuming the form. Gaseous fluid is then again admitted into the container to agitate the granular material for facilitating removal of the finished casting therefrom.
Inventors
- 👤 Erich Krzyzanowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:54
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/046; B22C11/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A method of making castings, comprising the steps of confining a body of granular material in a container; initially admitting into a bottom region of said container a stream of gaseous fluid requisite for agitating said granular material and for imparting to said body a state at least approaching fluidization; introducing into the thus agitated granular material a form consisting of a material subject to consumption on contact with a molten metal; terminating admission of said gaseous fluid to thereby permit settling of the granular material about and into contact with said form; admitting molten metal into said form whereby the metal assumes the configuration of the same while simultaneously consuming the form; and again admitting gaseous fluid into said bottom region of said container to agitate said granular material for facilitating removal of the finished casting therefrom.
Claim 2
Independent Claim
138 words
A method of making castings, comprising the steps of confining a body of granular material in a container; initially admitting into a bottom region of said container a stream of gaseous fluid requisite for agitating said granular material and for imparting to said body a state at least approaching fluidization; introducing into the thus agitated granular material a form consisting of a material subject to consumption on contact with a molten metal; terminating admission of said gaseous fluid to thereby permit settling of the granular material about and into contact with said form; admitting molten metal into said form whereby the metal assumes the configuration of the same while simultaneously consuming the form; and again admitting gaseous fluid into said bottom region of said container to agitate said granular material for facilitating removal of the finished casting therefrom.
Claim 3
Dependent Claim
31 words
A method as defined in claim 1, the steps of initially and again admitting gaseous fluid comprising admitting such gaseous fluid in such a manner as to fluidize said granular material.
Claim 4
Dependent Claim
21 words
A method as defined in claim 1, the step of terminating admission of said gaseous fluid comprising gradually terminating such admission.
Claim 5
Dependent Claim
39 words
A method as defined in claim 1; and further comprising the step of subjecting the interior of said container to underpressure subsequent to terminating admission of said gaseous fluid, whereby to facilitate settling and compacting of said granular material.
Claim 6
Dependent Claim
15 words
A method as defined in claim 1, said granular material being highly resistant to combustion.
Claim 7
Dependent Claim
13 words
A method as defined in claim 5, said granular material being ZrO 2.
Claim 8
Dependent Claim
19 words
A method as defined in claim 5, said granular material consisting of a mixture of sand and ZrO 2.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |