US2991520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cored passageway formation
Assignee: Howard Foundry Co
•
Filing: 1956-01-13
•
Granted: 1961-07-11
•
Expires: 1976-01-13
Abstract
No abstract record available.
Inventors
- 👤 Robert F Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:27
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C9/106; B22D; B22D29/00; B22D29/001; B22D29/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1310768A
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US818413A
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US1416412A
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US2045556A
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US2173955A
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US2304879A
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US2373405A
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US2362875A
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GB575734A
Cited
US2489280A
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US2688781A
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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) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |