Patent US4619963A successfully refreshed from Google Patents.
US4619963A
Expired / Lapsed
US
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Radiation shielding composite sheet material
Assignee: Toray Industries Inc
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Filing: 1984-07-02
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Granted: 1986-10-28
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Expires: 2004-07-02
Abstract
Abstract A radiation shielding composite sheet material contains lead fibers of more than 99% purity and containing 50 to 500 ppm tin. The fibers are of mean length of 0.5 to 1.3 mm and are imbedded in a synthetic resin, such that the composite sheet has a specific gravity greater than 4.0.
Inventors
- 👤 Hisataka Shoji
- 👤 Shigehiro Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:50
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/10; B22D; B22D11/00; B22D11/005; B22F1/00; B22F1/06; B22F1/062; G; G21; G21F; G21F1/00; G21F1/02; G21F1/10; G21F1/103; G21F1/106; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A radiation shielding composite sheet comprising lead fibers of more than 99% purity having 0.5 to 1.3 mm mean length and of a diameter of less than 60 microns and a synthetic resin, said fibers containing 50 to 500 ppm tin wherein said radiation shielding composite sheet has a specific gravity greater than 4.0.
Claim 2
Dependent Claim
54 words
A radiation shielding composite sheet comprising lead fibers of more than 99% purity having 0.5 to 1.3 mm mean length and of a diameter of less than 60 microns and a synthetic resin, said fibers containing 50 to 500 ppm tin wherein said radiation shielding composite sheet has a specific gravity greater than 4.0.
Claim 3
Dependent Claim
19 words
The radiation shielding composite sheet according to claim 1, wherein the lead fibers have a diameter of 30-40 microns.
Claim 4
Dependent Claim
18 words
The radiation shielding composite sheet according to claim 1, wherein the synthetic resin is a thermoplastic synthetic resin.
Claim 5
Dependent Claim
17 words
The radiation shielding composite sheet according to claim 3, wherein the thermoplastic synthetic resin is polyvinyl chloride.
Claim 6
Dependent Claim
18 words
The radiation shielding composite sheet according to claim 1, wherein the synthetic resin is a thermosetting synthetic resin.
Claim 7
Dependent Claim
17 words
The radiation shielding composite sheet according to claim 1, wherein the specific gravity is greater than 4.5.
Claim 8
Dependent Claim
16 words
The radiation shielding composite sheet according to claim 1, wherein the tin content is 100-200 ppm.
References Cited (Backward Citations)
US2168381A
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US2312921A
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US2367296A
Cited
US2986533A
Cited
US3185751A
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US3427264A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |