US2841845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of shell molds
Assignee: Ford Motor Co
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Filing: 1953-07-31
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Granted: 1958-07-08
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Expires: 1973-07-31
Abstract
No abstract record available.
Inventors
- 👤 Julius M Bleuenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:43
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
A PROCESS FOR THE PRODUCTION OF A SHELL MOLDING SAND COMPRISING HEATING MOLDING SAND SUBSTANTIALLY ABOVE THE BOILING POINT OF WATER, MULLING THIS HOT SAND, ADDING TO THE HOT SAND A PARTIALLY POLYMERIZED PHENOL-ALDEHYDE RESIN FREE OF ALL CATALYSTS CAPABLE OF EFFECTING FURTHER CONSEQUENTIAL ADVANCEMENT OF THE RESIN AT THE TEMPERATURE OF THE SAND AND PHENOL-ALDEHYDE RESIN, ADDING TO THE COOLED MIXTURE A POLYMERIZATION CATALYST, AND ADMIXING THE SAND, RESIN AND CATALYST.
References Cited (Backward Citations)
US2148642A
Cited
US2313672A
Cited
US2488332A
Cited
FR1005710A
Cited
US2662067A
Cited
US2706188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |