US4485838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for manufacturing lead fiber and radiation shielding material using the same
Assignee: Toray Industries Inc
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Filing: 1983-02-24
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Granted: 1984-12-04
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Expires: 2003-02-24
Abstract
Abstract A method of manufacturing lead fibers and radiation shielding materials using the lead fibers so manufactured as disclosed. The fibers contain 50 to 500 ppm of tin and preferably are below 60 microns in diameter. The fibers are produced by melt spinning through a spinneret. Radiation shielding materials can be made by dispersing the fibers homogeneously into a resin, which may be formed into sheets or which may be processed into woven, knitted or spin-bonded fabrics.
Inventors
- 👤 Hisataka Shoji
- 👤 Shigehiro Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:18
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/005; B22F; B22F1/00; B22F1/06; B22F1/062; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/10; G; G21; G21F; G21F1/00; G21F1/02; G21F1/10; G21F1/103; G21F1/106
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
54 words
In the method of manufacturing lead fibers of a mean diameter of less than 60 microns and a purity of more than 99% by melt spinning of molten lead through a spinneret having very small holes therein, the improvement comprising adding 50 to 500 ppm of tin to the molten lead prior to spinning.
Claim 2
Dependent Claim
54 words
In the method of manufacturing lead fibers of a mean diameter of less than 60 microns and a purity of more than 99% by melt spinning of molten lead through a spinneret having very small holes therein, the improvement comprising adding 50 to 500 ppm of tin to the molten lead prior to spinning.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein the lead fibers have a mean length of from 0.5 to 1.3 mm.
Claim 4
Dependent Claim
26 words
The method of claim 1, wherein the molten lead from which the fibers are spun is high purity lead having a purity of more than 99.9%.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |