Patent US1867862A successfully refreshed from Google Patents.
US1867862A
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US
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Piston-sand core
Assignee: Alcoa Corp
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Filing: 1929-11-15
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Granted: 1932-07-19
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Expires: 1949-11-15
Abstract
No abstract record available.
Inventors
- 👤 George L Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:07
CPC Classifications
B; B22; B22D; B22D15/00; B22D15/02; Y; Y10; Y10S; Y10S164/00; Y10S164/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-07-19 | 1936-01-18 | 1936-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-07-19 | 1940-01-18 | 1940-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-07-19 | 1944-01-18 | 1944-07-19 | $7700.00 | Window Closed / Lapsed |