US2970218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brick for radiation shields
Assignee: American Smelting and Refining Co
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Filing: 1958-10-29
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Granted: 1961-01-31
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Expires: 1978-10-29
Abstract
No abstract record available.
Inventors
- 👤 Frederick A C Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:07
CPC Classifications
G; G21; G21C; G21C11/00; G21C11/02; G21C11/028; G21F; G21F3/00; G21F3/04; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S428/00; Y10S428/911
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) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |