Patent US3874885A successfully refreshed from Google Patents.
US3874885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making foundry moulds and cores
Assignee: Individual
•
Filing: 1972-04-28
•
Granted: 1975-04-01
•
Expires: 1992-04-28
Abstract
Abstract A process of producing foundry moulds and cores from a moulding sand or sand mixture, containing moulding sand, hydraulic cement as a binder, an alkali-metal aluminate, an alkali-metal carbonate and a surface-active material.
Inventors
- 👤 Abram Moiseevich Lyass
- 👤 Pavel Afanasievich Borsuk
- 👤 Zokhrab Gamid Ogly Usubov
- 👤 Viktor Georgievich Kuzentsov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:03
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
A PROCESS OF MAKING FOUNDRY MOLDS AND CORES FROM A FLUID SELF-HARDENING SAND OR SAND MIXTURE WITH CONTROLLABLE PROPERTIES COMPRISING THE STEPS OF PREPARING (1) A MIXTURE CONSISTING ESSENTIALLY OF 100 PARTS BY WEIGHT OF MOLDING SAND, FROM 8 TO 15 PARTS BY WEIGHT OF HYDRAULIC CEMENT AS A BINDER, (2) A MIXTURE OF FROM 0.25 TO 1.5 PARTS BY WEIGHT OF AN ALKALIMETAL ALUMINATE AND FROM 0.5 TO 2.0 PARTS BY WEIGHT OF AN ALKALI-METAL CARBONATE AS THE HARDENNING ACCELERATOR, FROM 0.05 TO 0.2 PARTS BY WEIGHT OF A SURFACE-ACTIVE MATERIAL WITH A FOAMING ACTION; AND WATER; MIXING (1) AND (2) TO FORM A FLUID MASS; FORMING THE FOUNDRY MOLD AND CORES FROM SAID MASS AND HARDENING SAID MOLDS AND CORES IN AIR.
Claim 2
Dependent Claim
124 words
A PROCESS OF MAKING FOUNDRY MOLDS AND CORES FROM A FLUID SELF-HARDENING SAND OR SAND MIXTURE WITH CONTROLLABLE PROPERTIES COMPRISING THE STEPS OF PREPARING (1) A MIXTURE CONSISTING ESSENTIALLY OF 100 PARTS BY WEIGHT OF MOLDING SAND, FROM 8 TO 15 PARTS BY WEIGHT OF HYDRAULIC CEMENT AS A BINDER, (2) A MIXTURE OF FROM 0.25 TO 1.5 PARTS BY WEIGHT OF AN ALKALIMETAL ALUMINATE AND FROM 0.5 TO 2.0 PARTS BY WEIGHT OF AN ALKALI-METAL CARBONATE AS THE HARDENNING ACCELERATOR, FROM 0.05 TO 0.2 PARTS BY WEIGHT OF A SURFACE-ACTIVE MATERIAL WITH A FOAMING ACTION; AND WATER; MIXING (1) AND (2) TO FORM A FLUID MASS; FORMING THE FOUNDRY MOLD AND CORES FROM SAID MASS AND HARDENING SAID MOLDS AND CORES IN AIR.
Claim 3
Dependent Claim
15 words
The process as claimed in claim 1, in which the alkali-metal aluminate is sodium aluminate.
Claim 4
Dependent Claim
15 words
The process as claimed in claim 1 in which the alkali-metal carbonate is potassium carbonate.
Claim 5
Dependent Claim
17 words
The process as claimed in claim 1 in which the surface-active material is sodium alkyl aryl sulfonate.
Claim 6
Dependent Claim
79 words
In a liquid self-hardening mold or core mixture consisting essentially of 100 parts by weight of molding sand, from 8 to 15 parts by weight of hydraulic cement as a binder and from 0.05 to 0.2 part by weight of a surface-active substance with a foaming action and a self-hardening accelerating additive, the improvement consisting of, as said additive 0.5 to 2.0 parts by weight of potassium carbonate and from 0.25 to 1.5 parts by weight of sodium aluminate.
Claim 7
Dependent Claim
79 words
In a liquid self-hardening mold or core mixture consisting essentially of 100 parts by weight of molding sand, from 8 to 15 parts by weight of hydraulic cement as a binder and from 0.05 to 0.2 part by weight of a surface-active substance with a foaming action and a self-hardening accelerating additive, the improvement consisting of, as said additive 0.5 to 2.0 parts by weight of potassium carbonate and from 0.25 to 1.5 parts by weight of sodium aluminate.
Claim 8
Dependent Claim
25 words
The liquid self-hardening mold or core mixture as claimed in claim 5, wherein sodium alkyl aryl sulfonate is the self-active substance with a foaming action.
References Cited (Backward Citations)
US1748839A
Cited
US2880096A
Cited
US2806530A
Cited
US3140956A
Cited
US3196505A
Cited
US3666703A
Cited
US3600203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |