US3232771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molds and methods of preparing same
Assignee: Individual
•
Filing: 1962-06-29
•
Granted: 1966-02-01
•
Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 John W Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:19
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A GELLED REFRACTORY MOLD COMPOSITION, THE GELATION OCCURING UPON ADMIXTURE OF COMPOSITIONS A AND B, WHICH COMPRISES IN ADMIXTURE: (A) A POLYSILCIC ACID BINDER SOLUTION COMPOSITION COMPRISING THE ADMIXTURE OF ABOUT 3.2 TO 8 PERCENT BY WEIGHT OF AN ORGANIC SILICATE, A POLAR ORGANIC SOLVENT FOR THE ORGANIC SILICATE, AN ACID AND WATER, THE COMPOSITION A HAVING PH SUCH THAT THE POLYSILCIC ACID REMAINS IN SOLUTION; AND (B) A REFRACTORY COMPOSITION COMPRISING A PARTICULATE REFRACTORY MATERIAL, AT LEAST THE SURFACE OF WHICH HAS A PH PRIOR TO ADMIXTURE WIGH COMPOSITION A SUCH THAT THE RESULTING PH OF THE ADMIXTURE OF COMPOSITIONS A AND B IS BETWEEN ABOUT 4-6 AND SUCH THAT POLYSILICIC ACID IS PRECIPITATED ON THE SURFACE OF THE REFRACTORY MATERIAL, THE GELLED MOLD COMPOSITION BEING SUITABLE FOR SUBSEQUENT HEATING TO REMOVE VOLATILE MATERIALS.
Claim 2
Dependent Claim
135 words
A GELLED REFRACTORY MOLD COMPOSITION, THE GELATION OCCURING UPON ADMIXTURE OF COMPOSITIONS A AND B, WHICH COMPRISES IN ADMIXTURE: (A) A POLYSILCIC ACID BINDER SOLUTION COMPOSITION COMPRISING THE ADMIXTURE OF ABOUT 3.2 TO 8 PERCENT BY WEIGHT OF AN ORGANIC SILICATE, A POLAR ORGANIC SOLVENT FOR THE ORGANIC SILICATE, AN ACID AND WATER, THE COMPOSITION A HAVING PH SUCH THAT THE POLYSILCIC ACID REMAINS IN SOLUTION; AND (B) A REFRACTORY COMPOSITION COMPRISING A PARTICULATE REFRACTORY MATERIAL, AT LEAST THE SURFACE OF WHICH HAS A PH PRIOR TO ADMIXTURE WIGH COMPOSITION A SUCH THAT THE RESULTING PH OF THE ADMIXTURE OF COMPOSITIONS A AND B IS BETWEEN ABOUT 4-6 AND SUCH THAT POLYSILICIC ACID IS PRECIPITATED ON THE SURFACE OF THE REFRACTORY MATERIAL, THE GELLED MOLD COMPOSITION BEING SUITABLE FOR SUBSEQUENT HEATING TO REMOVE VOLATILE MATERIALS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |