US3816145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trihydroxydiphenyl as an additive for foundry green molding sands
Assignee: WHITEHEAD BROS CO
•
Filing: 1972-08-31
•
Granted: 1974-06-11
•
Expires: 1992-08-31
Abstract
Abstract Tridydroxydiphenyl is useful as an additive for improving the properties of foundry green molding sands or clays. The trihydroxydiphenyl is incorporated into the sand in the form of an aqueous solution. Alternatively, the solution may be applied to the surface of a green sand mold for use as a facing agent.
Inventors
- 👤 R Melcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:12
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B28; B28B; B28B7/00; B28B7/38; B28B7/384; Y; Y02; Y02P; Y02P40/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
21 words
A composition according to claim 1 containing up to about 5 parts of said solution per 100 parts of molding sand.
Claim 2
Dependent Claim
23 words
A composition according to claim 1 containing from about 1 to about 3 parts of said solution per 100 parts of molding sand.
Claim 3
Dependent Claim
23 words
A composition according to claim 1 wherein said solution contains from about 1 to about 2 parts of trihydroxydiphenyl per part of water.
Claim 4
Dependent Claim
17 words
A composition according to claim 4 wherein said solution contains about equal parts of trihydroxydiphenyl and water.
Claim 5
Dependent Claim
111 words
In a foundry green molding sand composition comprising molding sand, clay and water, the improvement comprising molding sand uniformly admixed with an aqueous solution of a solid resinous material comprising a residue remaining in the still after removing technical grade resorcinol as a distillate, said solid resinous material being a dark brown, brittle material having a ball and ring softening point of 80*C. to 88*C. and an isopropyl alcohol solubility of 94 percent to 98 1/2 percent, the proportions of water and the said resinous material in said aqueous solution and the amount of said solution in said molding sand being sufficient to impart improved green sand properties to said composition.
Claim 6
Dependent Claim
25 words
A composition according to claim 6 wherein said solution contains from about 1 to about 2 parts of said resinous material per part of water.
Claim 7
Dependent Claim
19 words
A composition according to claim 6 wherein said solution contains about equal parts of said resinous material and water.
Claim 8
Dependent Claim
22 words
A foundry molding sand according to claim 8 containing up to about 5 parts of said solution per 100 parts of sand.
Claim 9
Dependent Claim
25 words
A foundry molding sand according to claim 8 containing from about 1 to about 3 parts of said solution per 100 parts of said sand.
Claim 10
Dependent Claim
29 words
A foundry molding sand according to claim 8 wherein said aqueous solution contains up to about 0.25 parts of a dissolved, water-soluble hydroxide per part of said resinous material.
Claim 11
Dependent Claim
16 words
A foundry molding sand according to claim 11 wherein said hydroxide is an alkali metal hydroxide.
Claim 12
Dependent Claim
29 words
A foundry molding sand according to claim 12 wherein said aqueous solution contains from about 0.01 to about 0.15 parts of sodium hydroxide per part of said resinous material.
Claim 13
Dependent Claim
100 words
In a foundry green molding sand composition comprising molding sand, clay and water, the improvement comprising from about 0.35 parts to about 99 parts of a solid resinous material comprising a residue remaining in the still after removing technical grade resorcinol as a distillate, said solid resinous material being a dark brown, brittle material having a ball and ring softening point of 80*C. to 88*C. and an isopropyl alcohol solubility of 94 percent to 98 1/2 percent and 1 part of water, said aqueous solution being present in an amount sufficient to impart improved green sand properties to said composition.
Claim 14
Dependent Claim
43 words
A composition according to claim 14 wherein said aqueous solution comprises from about 0.5 to about 5 parts of said resinous material per part of water and up to about 0.25 parts of a dissolved, water-soluble hydroxide per part of said resinous material.
References Cited (Backward Citations)
US2753312A
Cited
US3232771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |