US3861447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding method
Assignee: Akita KK
•
Filing: 1972-10-27
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Granted: 1975-01-21
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Expires: 1992-10-27
Abstract
Abstract This application relates to a molding method including steps of embedding a form made of an instantaneously combustible material in a filler material in a flask covering the top of the flask, inducing negative or sub-atmospheric pressure in the filler material thereby compacting same, and pouring a molten metal into the form, whereupon the form material is gassified and the resultant gases are positively removed from the mold system.
Inventors
- 👤 Masao Hondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:18
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/03; B22C9/04; B22C9/046
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A molding method, comprising: embedding both a form made of an instantaneously combustible material, and a gas vent for venting gases formed from combustion of said material, in a mass of heat resistant particulate material contained in a flask; covering the open top of the flask with a plastic film as a lid; inducing a negative or sub-atmospheric pressure in said mAss thereby compacting said mass while maintaining the shape of said form; and pouring a molten metal into the form while still inducing said negative or sub-atmospheric pressure the molten metal gassifying said combustible material; and removing resultant gases through said vent.
Claim 2
Dependent Claim
103 words
A molding method, comprising: embedding both a form made of an instantaneously combustible material, and a gas vent for venting gases formed from combustion of said material, in a mass of heat resistant particulate material contained in a flask; covering the open top of the flask with a plastic film as a lid; inducing a negative or sub-atmospheric pressure in said mAss thereby compacting said mass while maintaining the shape of said form; and pouring a molten metal into the form while still inducing said negative or sub-atmospheric pressure the molten metal gassifying said combustible material; and removing resultant gases through said vent.
Claim 3
Dependent Claim
27 words
A molding method as set forth in claim 1 further comprising the step of covering said form made of an instantaneously combustible material with a shield member.
Claim 4
Dependent Claim
29 words
A molding method as set forth in claim 2 further comprising the step of providing a runner forming member made of an instantaneously combustible material in said shield member.
Claim 5
Dependent Claim
20 words
A molding method as set forth in claim 1 wherein said gas vent is formed of an instantaneously combustible material.
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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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |