US2923989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-lubricating shell molds
Assignee: —
•
Filing: —
•
Granted: 1960-02-09
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Expires: 1977-02-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:38
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A MOLDING COMPOSITION FOR FORMING SHELLS MOLDS CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF REFRACTORY FILLER AND A MINOR PROPORTION OF POTENTIALLY THERMOSETTING BINDER, THE IMPROVEMENT WHICH CONSISTS OF INCLUDING THEREWITH AS A MOLD RELEASE AGENT A SOLUTION OF A HIGH MELTING POINT WAX AND AT LEAST ONE ORGANIC SOLVENT FOR SAID WAX SELECTED FROM THE GROUP CONSISTING OF DIMETHYL PHTHALATE, DIETHYL PHTHALATE, DIBUTL PHTHALATE, DIAMYL PHTHALATE AND TRICRESYL PHOSPHATE IN AN AMOUNT SUCH THAT THE WAX AND SOLVENT CONSTITUTE APPROXIMATELY 0.02% TO 1% AND 0.2% TO 7%, RESPECTIVELY, OF THE TOTAL WEIGHT OF THE MOLDING COMPOSITION.
Claim 2
Dependent Claim
98 words
IN A MOLDING COMPOSITION FOR FORMING SHELLS MOLDS CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF REFRACTORY FILLER AND A MINOR PROPORTION OF POTENTIALLY THERMOSETTING BINDER, THE IMPROVEMENT WHICH CONSISTS OF INCLUDING THEREWITH AS A MOLD RELEASE AGENT A SOLUTION OF A HIGH MELTING POINT WAX AND AT LEAST ONE ORGANIC SOLVENT FOR SAID WAX SELECTED FROM THE GROUP CONSISTING OF DIMETHYL PHTHALATE, DIETHYL PHTHALATE, DIBUTL PHTHALATE, DIAMYL PHTHALATE AND TRICRESYL PHOSPHATE IN AN AMOUNT SUCH THAT THE WAX AND SOLVENT CONSTITUTE APPROXIMATELY 0.02% TO 1% AND 0.2% TO 7%, RESPECTIVELY, OF THE TOTAL WEIGHT OF THE MOLDING COMPOSITION.
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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |