US3679703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand core and mold compositions containing glycerine and an ammonium salt
Assignee: Goodrich Corp
•
Filing: 1970-10-16
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Granted: 1972-07-25
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Expires: 1990-10-16
Abstract
Abstract Dielectric baked sand cores and molds containing amine salts of copolymers of acrylonitrile and acrylic acid have improved resistance to humidity when these compositions also contain small amounts of an ammonium salt and glycerine.
Inventors
- 👤 James A Conrady
- 👤 John S Fitzpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:52
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2206; B22C1/222; C; C08; C08K; C08K13/00; C08K13/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
44 words
The composition of claim 1 wherein the polymer contains about 20 to 40 percent by weight of acrylic acid, at least about 50 percent of which is an aliphatic amine salt, and the amount of glycerine is from about 0.5 to two weight parts.
Claim 2
Dependent Claim
26 words
The composition of claim 2 wherein there is about 0.25 to two weight parts of polymer and the acid is neutralized with ammonia and a diamine.
Claim 3
Dependent Claim
11 words
The composition of claim 3 wherein the diamine is ethylene diamine.
Claim 4
Dependent Claim
27 words
The composition of claim 4 wherein there is present about 0.1 to 0.5 weight part of ammonium salt and about 0.5 to 1.5 weight parts of glycerine.
Claim 5
Dependent Claim
12 words
The composition of claim 5 wherein the ammonium salt is ammonium chloride.
Claim 6
Dependent Claim
12 words
The composition of claim 5 wherein the ammonium salt is ammonium carbonate.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |