Patent US2770859A successfully refreshed from Google Patents.
US2770859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating a metallic pattern for shell molding
Assignee: Motors Liquidation Co
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Filing: 1951-07-20
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Granted: 1956-11-20
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Expires: 1971-07-20
Abstract
No abstract record available.
Inventors
- 👤 Donald J Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:59
CPC Classifications
B; B22; B22C; B22C23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF TREATING A METALLIC PATTERN FOR EFFECTING THE RELEASE OF A SHELL-TYPE AND SAND-RESIN MOLD THEREFROM WHICH COMPRISES HEATING SAID PATTERN TO AT LEAST 250* F. AND COATING THE MOLDING SURFACE OF SAID HOT METALLIC PATTERN WITH A MIXTURE OF MINOR PROPORTIONS OF CARNAUBA WAX AND EMULSIFIER AND A MAJOR PROPORTION OF WATER FOR DISTRIBUTING SAID WAX ON SAID MOLDING SURFACE.
Claim 2
Independent Claim
63 words
A METHOD OF TREATING A METALLIC PATTERN FOR EFFECTING THE RELEASE OF A SHELL-TYPE AND SAND-RESIN MOLD THEREFROM WHICH COMPRISES HEATING SAID PATTERN TO AT LEAST 250* F. AND COATING THE MOLDING SURFACE OF SAID HOT METALLIC PATTERN WITH A MIXTURE OF MINOR PROPORTIONS OF CARNAUBA WAX AND EMULSIFIER AND A MAJOR PROPORTION OF WATER FOR DISTRIBUTING SAID WAX ON SAID MOLDING SURFACE.
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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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |