Patent US2997759A successfully refreshed from Google Patents.
US2997759A
Expired / Lapsed
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Shell molding mixture
Assignee: Motors Liquidation Co
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Filing: 1955-11-17
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Granted: 1961-08-29
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Expires: 1975-11-17
Abstract
No abstract record available.
Inventors
- 👤 Charles F Froberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:18
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2266; B22C1/224
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A MOLDING MATERIAL FOR FORMING SHELL MOLDS, SAID MOLDING MATERIAL CONSISTINESSENTIALLY OF A MAJOR PROPORTION OF A COMMINUTED REFRACTORY FILLER AND A MINOR PROPORTION OF AN ORGANIC BINDER CONTAINING 25% TO 75% BY WEIGHT OF THE REACTION PRODUCT OF FURFURAL AND A THERMOPLASTIC RESINOUS MATERIAL DERIVED FROM WOOD AND CONTAINING BOTH METHOXYL AND HYDROXYL GROUPS, A SMALL BUT EFFECTIVE AMOUNT NOT IN EXCESS OF 25% BY WEIGHT OF BINDER CURING AGENT, AND THE BALANCE SUBSTANTIALLY ALL NOVOLAK.
Claim 2
Dependent Claim
77 words
A MOLDING MATERIAL FOR FORMING SHELL MOLDS, SAID MOLDING MATERIAL CONSISTINESSENTIALLY OF A MAJOR PROPORTION OF A COMMINUTED REFRACTORY FILLER AND A MINOR PROPORTION OF AN ORGANIC BINDER CONTAINING 25% TO 75% BY WEIGHT OF THE REACTION PRODUCT OF FURFURAL AND A THERMOPLASTIC RESINOUS MATERIAL DERIVED FROM WOOD AND CONTAINING BOTH METHOXYL AND HYDROXYL GROUPS, A SMALL BUT EFFECTIVE AMOUNT NOT IN EXCESS OF 25% BY WEIGHT OF BINDER CURING AGENT, AND THE BALANCE SUBSTANTIALLY ALL NOVOLAK.
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |