US2848772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-lubricating shell molds
Assignee: Motors Liquidation Co
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Filing: 1953-04-15
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Granted: 1958-08-26
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Expires: 1973-04-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Kremer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
IN THE PROCESS OF FORMING A SHELL MOLD BY MIXING A MAJOR PROPORTION OF SAND WITH A MINOR PROPORTION OF A THERMOSETTING BINDER AND THEREAFTER PLACING SAID MIXTURE IN CONTACT WITH A HEATED PATTERN FOR A PERIOD OF TIME SUFFICIENT TO BOND A SUBSTANTIAL PORTION OF THE SAND PARTICLES TOGETHER, THE IMPROVEMENT WHICH CONSISTS IN ADDING CARNAUBA WAX AS A MOLD RELEASE AGENT TO THE MOLDING MIXTURE PRIOR TO CONTACT OF THE MIXTURE WITH THE PATTERN, SAID CARNAUBA WAX BEING ADDED IN AN AMOUNT CONSITUTING BETWEEN APPROXIMATELY 0.05% AND 1% OF THE TOTAL WEIGHT OF THE MIXTURE.
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) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |