Patent US2749587A successfully refreshed from Google Patents.
US2749587A
Expired / Lapsed
US
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Method of producing grey iron castings in preheated refractory coated male and female dies
Assignee: Walter Macfarlane & Co Lt
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Filing: 1952-12-08
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Granted: 1956-06-12
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Expires: 1972-12-08
Abstract
No abstract record available.
Inventors
- 👤 Richards James Aubrey
- 👤 Jeffrey Robert Stewart Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:59
CPC Classifications
B; B22; B22C; B22C3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1222786A
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US1453593A
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US1597861A
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US1492694A
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US2061765A
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US2087764A
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US2241270A
Cited
US2290305A
Cited
US2540242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |