US3108340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of foundry cores
Assignee: Dow Chemical Co
•
Filing: 1958-03-10
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Granted: 1963-10-29
•
Expires: 1978-03-10
Abstract
No abstract record available.
Inventors
- 👤 Adolph T Peters
- 👤 Valley Robert G La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:12
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
METHOD FOR FABRICATING FOUNDRY CORES AND MOLDS FROM SILICA SAND COMPOSITIONS WHICH COMPRISES MIXING SAID SAND WITH BETWEEN ABOUT 0.25 AND 10 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE DRY SAND IN THE COMPOSITION, OF A RESIN BINDER CONSISTING ESSENTIALLY OF A WATER-SOLUBLE SYNTHETIC UREA-FORMALDEHYDE RESIN IN WHICH THE MOLE RATIO OF FORMALDEHYDE TO UREA IF FROM ABOUT 1.5 TO 2.5:1, RESPECTIVELY; FABRICATING SAID SAND MIXTURE INTO A STRUCTURE SUITED FOR SHAPING METAL BY CASTING; AND
Claim 2
Dependent Claim
78 words
METHOD FOR FABRICATING FOUNDRY CORES AND MOLDS FROM SILICA SAND COMPOSITIONS WHICH COMPRISES MIXING SAID SAND WITH BETWEEN ABOUT 0.25 AND 10 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE DRY SAND IN THE COMPOSITION, OF A RESIN BINDER CONSISTING ESSENTIALLY OF A WATER-SOLUBLE SYNTHETIC UREA-FORMALDEHYDE RESIN IN WHICH THE MOLE RATIO OF FORMALDEHYDE TO UREA IF FROM ABOUT 1.5 TO 2.5:1, RESPECTIVELY; FABRICATING SAID SAND MIXTURE INTO A STRUCTURE SUITED FOR SHAPING METAL BY CASTING; AND
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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) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |