Patent US3970462A successfully refreshed from Google Patents.
US3970462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self setting molding process
Assignee: OCCIDENTIAL ELECTROCHEMICALS Corp
•
Filing: 1974-02-25
•
Granted: 1976-07-20
•
Expires: 1994-02-25
Abstract
Abstract Self setting molds for metal casting are produced using a liquid alkali metal silicate as the binder and a product obtained by reaction of three moles of glycerin and one mole of glacial acetic acid as the catalyst for the binder.
Inventors
- 👤 Neil W. Stillman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:18
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/186; B22C1/188
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
In a process for the production of a mold which comprises forming a mixture of an aggregate with 1 to 10 percent by weight of a liquid alkali metal silicate having an SiO 2 to alkali metal oxide ratio of about 2.0:1 to 3.3:1, shaping the resulting mixture, and curing the resulting shape at room temperature, the improvement comprising adding to said mixture from about 20 percent to about 40 percent by weight of the silicate of a curing agent prepared by refluxing three moles of glycerin and one mole of glacial acetic acid and distilling off volatiles at reflux until the temperature in the still head drops.
Claim 2
Dependent Claim
108 words
In a process for the production of a mold which comprises forming a mixture of an aggregate with 1 to 10 percent by weight of a liquid alkali metal silicate having an SiO 2 to alkali metal oxide ratio of about 2.0:1 to 3.3:1, shaping the resulting mixture, and curing the resulting shape at room temperature, the improvement comprising adding to said mixture from about 20 percent to about 40 percent by weight of the silicate of a curing agent prepared by refluxing three moles of glycerin and one mole of glacial acetic acid and distilling off volatiles at reflux until the temperature in the still head drops.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the aggregate is sand.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the silicate is sodium silicate.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the silicate is present in the range of 2.5 to 3.5 percent by weight.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein the SiO 2 to alkali metal oxide ratio in the silicate is in the range of 2.5:1 to 3.0:1.
Claim 7
Dependent Claim
9 words
A mold produced by the process of claim 1.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |