US3780309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated container for radioactive and like substances
Assignee: Robatel SLPI SA
•
Filing: 1970-07-28
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Granted: 1973-12-18
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Expires: 1990-07-28
Abstract
Abstract A double-walled container for radioactive material having an outer metal casing and an inner wall of lead and, in the space between the walls, an insulating material which is a solid mass of a mixture of hydrated alumina and hydrated iron oxide. The solid mass of insulating material may be formed in the space by pouring a mixture of an aqueous suspension of alumina trihydrate and particulate mild steel or iron into the space and allowing the mixture to set. The insulating material is effective in removing heat from the lead shield and in preventing heat reaching the lead shield from a source external of the container.
Inventors
- 👤 C Bochard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:39
CPC Classifications
G; G21; G21F; G21F5/00; G21F5/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
The container set forth in claim 1, wherein the insulating material also comprises approximAtely 15 percent of a compound adapted to form a crystal lattice.
Claim 2
Dependent Claim
14 words
The container set forth in claim 2, wherein said compound is calcium sulphate hemihydrate.
Claim 3
Dependent Claim
18 words
The container as set forth in claim 1, wherein the said solid mass also contains hydrated iron sesquioxide.
Claim 4
Dependent Claim
23 words
The container as set forth in claim 4, wherein the hydrated iron sesquioxide contains at least 25 percent by weight of iron powder.
Claim 5
Dependent Claim
37 words
The container as set forth in claim 1, wherein the insulating material also comprises approximately 15 percent of a compound adapted to form a crystal lattice; and wherein the said solid mass also contains hydrated iron sesquioxide.
Claim 6
Dependent Claim
31 words
The container as set forth in claim 6, wherein said compound is calcium sulphate hemihydrate; and wherein the hydrated iron sesquioxide contains at leat 25 percent by weight of iron powder.
References Cited (Backward Citations)
US2992175A
Cited
US2726339A
Cited
US2773459A
Cited
US3453160A
Cited
US3466444A
Cited
US3558526A
Cited
US3569714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |