Patent US4137181A successfully refreshed from Google Patents.
Patent US2977236A successfully refreshed from Google Patents.
US2977236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core binder
Assignee: International Minerals and Chemical Corp
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Filing: 1957-12-30
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Granted: 1961-03-28
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Neukom Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:01
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN THE PREPARATION OF A FOUNDRY CORE, THE IMPROVEMENT WHICH COMPRISES COMMINGLING SAND WITH WATER IN A PROPORTION AFFORDING A WATER CONTENT BETWEEN ABOUT 2 AND ABOUT 6% BY WEIGHT AND BETWEEN ABOUT 0.1 AND ABOUT 3% BY WEIGHT OF AN ALKALI-METAL PHOSPHATE-MODIFIED STARCH, PREPARED BY SOAKING DRY, UNGELATINIZED STARCH IN AN AQUEOUS ALKALI-METAL ORTHOPHOSPHATE SOLUTION HAVING A PH BETWEEN ABOUT 4 AND ABOUT 7 TO INCORPORATE SAID ALKALI-METAL ORTHOPHOSPHATE THEREIN IN A PROPORTION EQUIVALENT TO AT LEAST ABOUT 1% BY WEIGHT OF PHOSPHORUS, DRY BASIS, REMOVING SURFACE MOISTURE FROM THE STARCH, DRYING THE STARCH TO A MOISTURE CONTENT LESS THAN ABOUT 15% BY WEIGHT AT A TEMPERATURE BELOW THE GELATINIZATION POINT THEREOF, BAKING THE DRIED STARCH AT A TEMPERATURE BETWEEN ABOUT 120 AND ABOUT 175*C. FOR A PERIOD OF ABOUT 1 TO ABOUT 15 HOURS, THE LENGTH OF THE BAKING PERIOD VARYING INVERSELY WITH THE TEMPERATURE, FORMING THE RESULTING MIXTURE INTO THE DESIRED SHAPE, AND BAKING THE SHAPED MIXTURE AT TEMPERATURE BETWEEN ABOUT 300 AND ABOUT 600*F.
Claim 2
Dependent Claim
168 words
IN THE PREPARATION OF A FOUNDRY CORE, THE IMPROVEMENT WHICH COMPRISES COMMINGLING SAND WITH WATER IN A PROPORTION AFFORDING A WATER CONTENT BETWEEN ABOUT 2 AND ABOUT 6% BY WEIGHT AND BETWEEN ABOUT 0.1 AND ABOUT 3% BY WEIGHT OF AN ALKALI-METAL PHOSPHATE-MODIFIED STARCH, PREPARED BY SOAKING DRY, UNGELATINIZED STARCH IN AN AQUEOUS ALKALI-METAL ORTHOPHOSPHATE SOLUTION HAVING A PH BETWEEN ABOUT 4 AND ABOUT 7 TO INCORPORATE SAID ALKALI-METAL ORTHOPHOSPHATE THEREIN IN A PROPORTION EQUIVALENT TO AT LEAST ABOUT 1% BY WEIGHT OF PHOSPHORUS, DRY BASIS, REMOVING SURFACE MOISTURE FROM THE STARCH, DRYING THE STARCH TO A MOISTURE CONTENT LESS THAN ABOUT 15% BY WEIGHT AT A TEMPERATURE BELOW THE GELATINIZATION POINT THEREOF, BAKING THE DRIED STARCH AT A TEMPERATURE BETWEEN ABOUT 120 AND ABOUT 175*C. FOR A PERIOD OF ABOUT 1 TO ABOUT 15 HOURS, THE LENGTH OF THE BAKING PERIOD VARYING INVERSELY WITH THE TEMPERATURE, FORMING THE RESULTING MIXTURE INTO THE DESIRED SHAPE, AND BAKING THE SHAPED MIXTURE AT TEMPERATURE BETWEEN ABOUT 300 AND ABOUT 600*F.
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |