Patent US4303553A successfully refreshed from Google Patents.
US4303553A
Expired / Lapsed
US
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Neutron-protection heat insulating material
Assignee: Nichias Corp
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Filing: 1978-09-28
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Granted: 1981-12-01
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Expires: 1998-09-28
Abstract
Abstract A neutron protection thermal insulating material is obtained by adding a boron compound and, if necessary, a hydrous compound, to chrysotile asbestos fibers. To form the material, the asbestos is opened with the use of a surface active agent in the presence of water. The boron compound is added and air bubbles are incorporated into the mixture which is then dried, molded and compressed. The resulting product is characterized by a construction wherein the opened asbestos fibers are oriented in substantially parallel relation to each other and in the direction perpendicular to the compression direction and air pockets are flatly arranged between the fibers and substantially parallel thereto to reduce thermal conduction through the material in the direction parallel to the direction of compression.
Inventors
- 👤 Susumu Aoki
- 👤 Hirosi Asaumi
- 👤 Shigeo Take
- 👤 Junichi Miyakoshi
- 👤 Hiroshi Takemoto
- 👤 Kenta Kabayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:22
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; C04B14/00; C04B14/38; C04B14/40; G; G21; G21C; G21C11/00; G21C11/08; G21C11/081; G21F; G21F1/00; G21F1/02; G21F1/06; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90; Y10S376/904; Y10S428/00; Y10S428/911; Y10S428/92; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A neutron-protection heat insulating material comprising: (a) a unidirectionally compressed sheet-like structure containing chrysotile asbestos fibers having a diameter of about 0.1 microns and having a density of from about 0.2 to about 1.0 g/cm 3 ; (b) a boron-containing compound in the amount of from about 5 to about 40 percent by weight of the sheet-like structure; and (c) said sheet-like structure containing a plurality of substantially flat air spaces having substantially greater dimensions normal to the direction of compression than parallel thereto.
Claim 2
Dependent Claim
84 words
A neutron-protection heat insulating material comprising: (a) a unidirectionally compressed sheet-like structure containing chrysotile asbestos fibers having a diameter of about 0.1 microns and having a density of from about 0.2 to about 1.0 g/cm 3 ; (b) a boron-containing compound in the amount of from about 5 to about 40 percent by weight of the sheet-like structure; and (c) said sheet-like structure containing a plurality of substantially flat air spaces having substantially greater dimensions normal to the direction of compression than parallel thereto.
Claim 3
Dependent Claim
18 words
The neutron-protection heat insulating material recited in claim 1 further comprising a hydrous compound in said sheet-like structure.
Claim 4
Dependent Claim
16 words
The neutron-protection heat insulating material recited in claim 2 wherein said hydrous compound is magnesium hydroxide.
Claim 5
Dependent Claim
15 words
The neutron-protection heat insulating material recited in claim 2 wherein said hydrous compound contains boron.
Claim 6
Dependent Claim
20 words
The neutron-protection heat insulating material recited in claim 2 wherein said hydrous compound has a water content exceeding 15 percent.
Claim 7
Dependent Claim
13 words
The neutron-protection heat insulating material recited in claim 1 further comprising a binder.
Claim 8
Dependent Claim
21 words
The neutron-protection heat insulating material recited in claim 6 wherein said binder comprises less than 20 percent of said sheet-like structure.
Claim 9
Dependent Claim
28 words
The neutron-protection heat insulating material recited in claim 1 further comprising a metallic jacket covering said sheet-like structure selected from the group consisting of iron and stainless steel.
Claim 10
Independent Claim
121 words
A method of manufacturing a neutron-protection heat insulating material comprising: (a) mixing one part of chrysotile asbestos with from about 40 to about 50 parts of water; (b) adding an effective amount of surface active agent and stirring to open said asbestos to fibers of about 0.1 microns diameter; (c) adding a boron-containing compound to the mixture in the ratio of from about 5 to about 40 percent of the finished product; (d) introducing air bubbles into the mixture to produce a mixture having a dried density of no more than about 0.02 g/cm 3 ; (e) drying the mixture; and (f) unidirectionally compressing the dried mixture into a sheet having from about 1/20 to about 1/100 of its uncompressed thickness.
Claim 11
Independent Claim
121 words
A method of manufacturing a neutron-protection heat insulating material comprising: (a) mixing one part of chrysotile asbestos with from about 40 to about 50 parts of water; (b) adding an effective amount of surface active agent and stirring to open said asbestos to fibers of about 0.1 microns diameter; (c) adding a boron-containing compound to the mixture in the ratio of from about 5 to about 40 percent of the finished product; (d) introducing air bubbles into the mixture to produce a mixture having a dried density of no more than about 0.02 g/cm 3 ; (e) drying the mixture; and (f) unidirectionally compressing the dried mixture into a sheet having from about 1/20 to about 1/100 of its uncompressed thickness.
Claim 12
Dependent Claim
33 words
The method recited in claim 9 further comprising said step of unidirectionally compressing being continued until the resulting sheet has a bulk density of from about 0.2 to about 1 g/cm 3 .
Claim 13
Dependent Claim
22 words
The method recited in claim 9 further comprising adding a hydrous compound to said mixture before the step of introducing air bubbles.
Claim 14
Dependent Claim
21 words
The method recited in claim 9 further comprising adding a binder to said mixture before the step of introducing air bubbles.
Claim 15
Dependent Claim
18 words
A neutron-protection heat insulating material made by the method of any of claims 9, 10, 11 or 12.
Claim 16
Dependent Claim
20 words
The method recited in claim 9 wherein said dried density is from about 0.01 to about 0.02 g/cm 3 .
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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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |