Patent US3203057A successfully refreshed from Google Patents.
US3203057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making cores and molds, articles made thereby and binder compositions therefor
Assignee: Individual
•
Filing: 1963-03-13
•
Granted: 1965-08-31
•
Expires: 1983-03-13
Abstract
No abstract record available.
Inventors
- 👤 Charles R Hunt
- 👤 Stewart Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:20
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
A BINDER FOR SAND CORES FOR METAL CASTING CONSISTING OF A LIQUID COMPONENT CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF ALKALI-METAL SILICATE HAVING AN ALKALINITY CALCULATED AS WEIGHT PERCENT OF FREE ALKALI HYDROXIDE IN THE RANGE OF 18 TO 30, AND A DRY COMPONENT CONSISTING ESSENTIALLY OF ABOUT 3 TO 100% OF AL2O3 BASED UPON THE WEIGHT OF THE ALKALI-METAL SILICATE SOLUTION.
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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |