US3717694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot pressing a refractory article of complex shape in a mold of simple shape
Assignee: Unifrax I LLC
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Filing: 1970-11-09
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Granted: 1973-02-20
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Expires: 1990-11-09
Abstract
Abstract In a method for making various hot pressed shapes using simple mold or die forms, a simple compacted refractory form is machined to a desired shape with the removal of a part. The desired shape and part are reassembled with the distribution of a parting agent therebetween within a mold so as to substantially conform to the configuration of the mold. After hot pressing the shape and part, the desired shape is removed.
Inventors
- 👤 E Pleasant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:13
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32; C04B33/326; C04B35/00; C04B35/01; C04B35/515; C04B35/56; C04B35/563; C04B35/565; C04B35/575; C04B35/58; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63416; C04B35/64; C04B35/645
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
A method of making a hot pressed refractory product having a desired shape different than the interior shape of the hot press mold comprising mixing a refractory powder with a binder, compressing the refractory powder into a form at a pressure from about 50 pounds per square inch to about 500 pounds per square inch at a temperature below about 500 degrees Centigrade, fabricating said form into a desired shape with the removal of at least one part, reassembling said shape and said part with the distribution of a parting agent therebetween within a mold so as to substantially conform to the configuration of the mold, compressing at a pressure of about 1,000 pounds per square inch to about 10,000 pounds per square inch and heating to a temperature of about 800* Centigrade to about 2,200* Centigrade the desired shape and the part, removing the desired shape and separating it from the part or parts and the parting agent.
Claim 2
Independent Claim
159 words
A method of making a hot pressed refractory product having a desired shape different than the interior shape of the hot press mold comprising mixing a refractory powder with a binder, compressing the refractory powder into a form at a pressure from about 50 pounds per square inch to about 500 pounds per square inch at a temperature below about 500 degrees Centigrade, fabricating said form into a desired shape with the removal of at least one part, reassembling said shape and said part with the distribution of a parting agent therebetween within a mold so as to substantially conform to the configuration of the mold, compressing at a pressure of about 1,000 pounds per square inch to about 10,000 pounds per square inch and heating to a temperature of about 800* Centigrade to about 2,200* Centigrade the desired shape and the part, removing the desired shape and separating it from the part or parts and the parting agent.
Claim 3
Dependent Claim
27 words
A process for producing hot pressed shapes in accordance with claim 1 wherein the part and the desired shape are reassembled adjacent each other within said mold.
Claim 4
Dependent Claim
29 words
A process for producing hot pressed shapes in accordance with claim 1 wherein said part and said shape are reassembled side by side adjacent each other within said mold.
Claim 5
Dependent Claim
29 words
A process for producing hot pressed shapes in accordance with claim 1 wherein said refractory powder is selected from the group consisting of carbides, borides, oxides, nitrides or silicides.
Claim 6
Dependent Claim
33 words
A process for producing hot pressed shapes in accordance with claim 1 comprising the additional step of mixing the parting agent with a liquid prior to distribution between said shape and said part.
Claim 7
Dependent Claim
28 words
A process for producing hot pressed shapes in accordance with claim 1 wherein the refractory powder is selected from the group consisting of boron carbide and silicon carbide.
References Cited (Backward Citations)
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US3440312A
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US3456048A
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US3589880A
Cited
US3455682A
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US3535132A
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |