US3558526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement matrix radiation shielding compositions containing calcium compounds
Assignee: Individual
•
Filing: 1967-08-01
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Granted: 1971-01-26
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Expires: 1987-08-01
Abstract
Abstract A RADIATION SHIELDING COMPOSITION CONSISTING ESSENTIALLY OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, CALCIUM OXIDE, CALCIUM HYDROXIDE, AND MIXTURES THEREOF UNIFORMLY DISPERSED THROUGHOUT A CEMENT MATRIX.
Inventors
- 👤 William Cornelius Hall
- 👤 John Merriam Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:28
CPC Classifications
G; G21; G21F; G21F1/00; G21F1/02; G21F1/04
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |