US2456769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reclaiming foundry sand
Assignee: Individual
•
Filing: 1944-02-16
•
Granted: 1948-12-21
•
Expires: 1964-02-16
Abstract
No abstract record available.
Inventors
- 👤 Alfred C Christensen
- 👤 Robert L Mcilvaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:15
CPC Classifications
B; B22; B22C; B22C5/00; B22C5/08; B22C5/18; B22C5/185; Y; Y10; Y10S; Y10S241/00; Y10S241/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB455569A
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US2117977A
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US2188798A
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US2192310A
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US2240718A
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US2331135A
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US2264610A
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US2331102A
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US2326218A
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US2384573A
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US2314486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |