US2997755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ejector and sealing means especially suitable for loose pieces in sand molding apparatus
Assignee: Individual
•
Filing: 1958-12-09
•
Granted: 1961-08-29
•
Expires: 1978-12-09
Abstract
No abstract record available.
Inventors
- 👤 Richard L Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:07
CPC Classifications
B; B22; B22C; B22C21/00; B22C21/12; B22C17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |