Patent EP0110538A2 successfully refreshed from Google Patents.
US3755240A
Expired / Lapsed
US
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Thermosetting pulverulent binder
Assignee: Wintershall Dea International AG
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Filing: 1970-12-14
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Granted: 1973-08-28
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Expires: 1990-12-14
Abstract
Abstract Thermosetting pulverulent binders suitable for use in manufacturing foundry molds comprising (a) phenolformaldehyde novolak finely ground with hexamethylene-tetramine, (b) magnesium oxide and (c) mineral oil are prepared by spraying a pulverulent mixture of (a) and (b) maintained in a fluidized state with mineral oil.
Inventors
- 👤 W Lucker
- 👤 H Vietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:47
CPC Classifications
C; C08; C08J; C08J3/00; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; B22C1/24; B22C5/00; C08J2361/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
The method of claim 1 wherein the amount of the said magnesium oxide employed is such that the resulting binder contains 6 to 12 weight percent of magnesium oxide.
Claim 2
Dependent Claim
16 words
The method of claim 1 wherein the novolak employed contains about 11 weight percent of hexamethylenetetramine.
Claim 3
Dependent Claim
42 words
The method of claim 1 wherein the amount of said mineral oil employed is such that the resulting binder contains 3 to 4 weight percent of oil and the said oil has a viscosity of 20* to 25* E. at 20* C.
Claim 4
Dependent Claim
75 words
The method of claim 1 wherein the said novolak employed contains 11 weight percent of hexamethylenetetramine, the amount of the said magnesium oxide employed is such that the resulting binder contains 6 to 12 weight percent magnesium oxide, the amount of said mineral oil employed is such that the resulting binder contains 3 to 4 weight percent of mineral oil and the said oil has a viscosity of 20* to 25* E. at 20* C.
Claim 5
Dependent Claim
12 words
The thermosetting pulverulent binder as prepared by the method of claim 1.
References Cited (Backward Citations)
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US3535252A
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |