Patent US2732600A successfully refreshed from Google Patents.
US2732600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand cores having high-temperature strength
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
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Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
A METHOD OF TREATING A SAND CORE TO INCREASE ITS HIGH-TEMPERATURE STRENGTH WHICH COMPRISES IMMERSING A SAND CORE IN AN ETHYL SILICATE SOLUTION FOR A PERIOD OF TIME SUFFICIENT TO SOAK SUBSTANTIALLY THROUGH SAID CORE, AND SUBSEQUENTLY IMMERSING SAID CORE IN A WATERGLASS SOLUTION FOR A TIME SUFFICIENT TO FORM A HARD OUTER SUPPORTING LAYER.
Claim 2
Independent Claim
55 words
A METHOD OF TREATING A SAND CORE TO INCREASE ITS HIGH-TEMPERATURE STRENGTH WHICH COMPRISES IMMERSING A SAND CORE IN AN ETHYL SILICATE SOLUTION FOR A PERIOD OF TIME SUFFICIENT TO SOAK SUBSTANTIALLY THROUGH SAID CORE, AND SUBSEQUENTLY IMMERSING SAID CORE IN A WATERGLASS SOLUTION FOR A TIME SUFFICIENT TO FORM A HARD OUTER SUPPORTING LAYER.
Claim 3
Dependent Claim
27 words
A UNITARY SAND CORE CHARACTERIZED BY HIGH-TEMPERATURE STRENGTH AND HAVING AN INTERIOR PORTION IMPREGNATED WITH ETHYL SILICATE AND AN OUTER LAYER IMPREGNATED WITH WATERGLASS AND ETHYL SILICATE.
Claim 4
Dependent Claim
27 words
A UNITARY SAND CORE CHARACTERIZED BY HIGH-TEMPERATURE STRENGTH AND HAVING AN INTERIOR PORTION IMPREGNATED WITH ETHYL SILICATE AND AN OUTER LAYER IMPREGNATED WITH WATERGLASS AND ETHYL SILICATE.
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) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |