Patent US2988522A successfully refreshed from Google Patents.
US2988522A
Expired / Lapsed
US
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Graphite boron neutron shielding
Assignee: North American Aviation Corp
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Filing: 1955-11-25
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Granted: 1961-06-13
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Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
- 👤 Charles R F Smith
- 👤 Edward L Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:07
CPC Classifications
G; G21; G21C; G21C11/00; G21C11/02; G21C11/028; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; G21F; G21F1/00; G21F1/02; G21F1/06; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF FROM ABOUT 10% TO 90% BY WEIGHT OF A FRIT CONSISTING ESSENTIALLY OF FROM 53% TO 64% BY WEIGHT OF MAGNESIUM OXIDE AND THE REMAINDER OF BORON OXIDE, AND THE REMAINDER FROM 90% TO 10% BY WEIGHT OF GRAPHITE.
Claim 2
Dependent Claim
46 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF FROM ABOUT 10% TO 90% BY WEIGHT OF A FRIT CONSISTING ESSENTIALLY OF FROM 53% TO 64% BY WEIGHT OF MAGNESIUM OXIDE AND THE REMAINDER OF BORON OXIDE, AND THE REMAINDER FROM 90% TO 10% BY WEIGHT OF GRAPHITE.
References Cited (Backward Citations)
US1577124A
Cited
US1653850A
Cited
US1674961A
Cited
US670671A
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US1458725A
Cited
US2063329A
Cited
GB456602A
Cited
US2106578A
Cited
US2769918A
Cited
US2688562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |