US2933789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon-free shell molds
Assignee: Dow Chemical Co
•
Filing: 1956-09-26
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Granted: 1960-04-26
•
Expires: 1976-09-26
Abstract
No abstract record available.
Inventors
- 👤 Ronald H Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:17
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; B22C23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
COMPOSITION FOR THE FABRICATION OF CARBON-FREE SHELL MOLDS AND THE LIKE WHICH CONSISTS ESSENTIALLY OF A PREPONDERANT PROPORTION OF SAND, A MINOR PROPORTION OF BETWEEN ABOUT 3 AND 15 PERCENT BY WEIGHT, BASIED ON THE WEIGHT OF THE COMPOSITION, OF A FUSIBLE SILICA GLASS POWDER, AND A BINDING QUANTITY OF A THERMOPLASTICTHERMOSETTING ORGANIC RESINOUS MATERIAL, SAID RESINOUS MATERIAL CONSISTING ESSENTIALLY OF A MIXTURE OF (A) AN AQUEOUS LIQUID PHENOL-FORMALDEHYDE RESIN THAT HAS A GREATER THAN 1:1 MOLE RATIO OF FORMALDEHYDE TO PHENOL, RESPECTIVELY, A SOLIDS CONTENT OF AT LEAST ABOUT 50 PERCENT BY WEIGHT, A PH BETWEEN 5 AND 9 AND A VISCOSITY AT 77*F. BETWEEN ABOUT 100 AND ABOUT 1,000 CENTIPOISES AND (B) BETWEEN ABOUT 10 AND 25 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF SAID RESIN, OF AN ACTIVE POWDERED MAGNESIUM OXIDE HAVING AN INITIAL SETTING TIME OF LESS THAN ABOUT 6 HOURS.
Claim 2
Dependent Claim
146 words
COMPOSITION FOR THE FABRICATION OF CARBON-FREE SHELL MOLDS AND THE LIKE WHICH CONSISTS ESSENTIALLY OF A PREPONDERANT PROPORTION OF SAND, A MINOR PROPORTION OF BETWEEN ABOUT 3 AND 15 PERCENT BY WEIGHT, BASIED ON THE WEIGHT OF THE COMPOSITION, OF A FUSIBLE SILICA GLASS POWDER, AND A BINDING QUANTITY OF A THERMOPLASTICTHERMOSETTING ORGANIC RESINOUS MATERIAL, SAID RESINOUS MATERIAL CONSISTING ESSENTIALLY OF A MIXTURE OF (A) AN AQUEOUS LIQUID PHENOL-FORMALDEHYDE RESIN THAT HAS A GREATER THAN 1:1 MOLE RATIO OF FORMALDEHYDE TO PHENOL, RESPECTIVELY, A SOLIDS CONTENT OF AT LEAST ABOUT 50 PERCENT BY WEIGHT, A PH BETWEEN 5 AND 9 AND A VISCOSITY AT 77*F. BETWEEN ABOUT 100 AND ABOUT 1,000 CENTIPOISES AND (B) BETWEEN ABOUT 10 AND 25 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF SAID RESIN, OF AN ACTIVE POWDERED MAGNESIUM OXIDE HAVING AN INITIAL SETTING TIME OF LESS THAN ABOUT 6 HOURS.
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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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |