Patent US3766969A successfully refreshed from Google Patents.
US3766969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air breathing flask for foundry mold
Assignee: Full Mold Process Inc
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Filing: 1970-08-10
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Granted: 1973-10-23
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Expires: 1990-08-10
Abstract
Abstract Disclosed herein is a flask and pouring apparatus for casting molten metals using vaporizable patterns wherein the flask has air breathing walls that are provided with a permeable layer, slotted vents, or screen vents.
Inventors
- 👤 C Mezby
- 👤 A Paoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:54
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
The combination of a cellular plastic pattern having the shape of an article to be cast embedded in a mold forming material for vaporization by the heat of a molten casting charge, said mold forming material being in a flowable state, a container having an open top, said container having double perforated walls and gas permeable closure means layer disposed between said walls covering said perforations for preventing the flow of mold forming material out through said perforations while allowing for the free flow of gases through said perforations.
Claim 2
Dependent Claim
89 words
The combination of a cellular plastic pattern having the shape of an article to be cast embedded in a mold forming material for vaporization by the heat of a molten casting charge, said mold forming material being in a flowable state, a container having an open top, said container having double perforated walls and gas permeable closure means layer disposed between said walls covering said perforations for preventing the flow of mold forming material out through said perforations while allowing for the free flow of gases through said perforations.
Claim 3
Dependent Claim
17 words
Structure as set forth in claim 1 wherein the gas permeable closure means is fine wire mesh.
Claim 4
Dependent Claim
16 words
Structure as set forth in claim 1 wherein the gas permeable closure means is asbestos cloth.
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US2060350A
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US2243445A
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GB789769A
Cited
US2830343A
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US3259677A
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US3157924A
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |