Patent US4765458A successfully refreshed from Google Patents.
US4765458A
Expired / Lapsed
US
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Asbestos free hardened monolithic filler mass
Assignee: NI Industries Inc
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Filing: 1986-10-14
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Granted: 1988-08-23
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Expires: 2006-10-14
Abstract
Abstract A calcium silicate filler mass for use in storing a gas solution or liquid gas, said filler mass having a high compressive strength and containing at least 0.5 weight percent reinforcing carbon fibers uniformly disposed within said calcium silicate, said filler having uniformly distributed throughout very fine pores of less than about 25 microns, and being substantially absent of voids and having a porosity of at least about 85%. There is also disclosed an acetylene storage vessel for storing gas solutions of acetylene which includes said silicate filler mass disposed within a metal shell and a method of forming said acetylene storage vessel.
Inventors
- 👤 Edith M. Flanigen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:06
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/0051; C04B28/00; C04B28/18; F; F17; F17C; F17C11/00; F17C11/002; C04B2111/00; C04B2111/10; C04B2111/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
73 words
An asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass for use in storing a gas solution or liquid gas, said filler mass comprising at least about 0.5 weight percent reinforcing refractory carbon fibers uniformly distributed within said calcium silicate, said filler having uniformly distributed throughout very fine pores of less than about 25 microns, and being substantially absent of voids, and a porosity of at least about 85 percent.
Claim 2
Dependent Claim
73 words
An asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass for use in storing a gas solution or liquid gas, said filler mass comprising at least about 0.5 weight percent reinforcing refractory carbon fibers uniformly distributed within said calcium silicate, said filler having uniformly distributed throughout very fine pores of less than about 25 microns, and being substantially absent of voids, and a porosity of at least about 85 percent.
Claim 3
Dependent Claim
36 words
An asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass according to claim 1 wherein calcium silicate filler mass contains between about 0.5 weight percent and 20 weight percent reinforcing refractory carbon fibers.
Claim 4
Dependent Claim
38 words
An asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass according to claim 1 wherein said filler mass has at least about 50 weight percent crystalline phase based on the weight of the calcium silicate.
Claim 5
Dependent Claim
35 words
An asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass according to claim 1 wherein said refractory carbon reinforcing fibers have a length of between about 1/8 inch and about 3 inches.
Claim 6
Dependent Claim
32 words
An asbestos free, porous, heat hardened monolithic calcium silicate filler mass according to claim 4, wherein the diameter of said refractory carbon reinforcing fibers is between about 5 microns and 50 microns.
Claim 7
Dependent Claim
26 words
An asbestos free, porous, heat hardened monolithic calcium silicate filler mass according to claim 1, wherein said filler mass has a porosity of at least 90%.
Claim 8
Dependent Claim
104 words
An acetylene storage vessel for storing gas solutions of acetylene, said storage vessel comprising a metal shell having uniformly distributed therein an asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass, the clearance between said metal shell and said filler mass being less than about 1/8 inch, said calcium silicate filler mass having at least about 0.5 weight percent reinforcing refractory carbon fibers uniformly disposed in said filler mass, said filler mass having uniformly distributed throughout very fine pores of less than about 25 microns and having a porosity of at least about 85 volume percent and containing substantially no voids.
Claim 9
Dependent Claim
104 words
An acetylene storage vessel for storing gas solutions of acetylene, said storage vessel comprising a metal shell having uniformly distributed therein an asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass, the clearance between said metal shell and said filler mass being less than about 1/8 inch, said calcium silicate filler mass having at least about 0.5 weight percent reinforcing refractory carbon fibers uniformly disposed in said filler mass, said filler mass having uniformly distributed throughout very fine pores of less than about 25 microns and having a porosity of at least about 85 volume percent and containing substantially no voids.
Claim 10
Dependent Claim
25 words
An acetylene storage vessel according to claim 1 wherein said filler mass contains about 0.5 weight percent to about 20 weight percent refractory carbon fibers.
Claim 11
Dependent Claim
21 words
An acetylene storage vessel according to claim 7 wherein said calcium silicate filler mass has 50 weight percent of crystalline phase.
Claim 12
Dependent Claim
24 words
An acetylene storage vessel according to claim 7 wherein said reinforcing refractory carbon fibers have a length of about 1/8 inch and 3 inches.
Claim 13
Dependent Claim
24 words
An acetylene storage vessel according to claim 10 wherein said refractory carbon reinforcing fibers have a diameter of about 5 microns and 50 microns.
Claim 14
Dependent Claim
24 words
An acetylene storage vessel according to claim 7 wherein said calcium silicate filler mass has a porosity of at least about 90 volume percent.
Claim 15
Independent Claim
190 words
A method of forming an acetylene storage vessel having disposed therein an asbestos free, porous, heat hardened, monolithic calcium silicate filler mass comprising: (a) providing an asbestos free aqueous slurry comprising at least about 85 percent volume water, CaO and SiO 2 wherein the weight ratio of CaO to SiO 2 is about 0.6 to about 1.0, and having uniformly dispersed in the aqueous slurry at least about 0.5 weight percent, based on the solids in said slurry, of refractor carbon fibers; (b) pouring said asbestos free aqueous slurry composition into a metal shell so as to substantially fill said metal shell; (c) autoclaving said slurry in said metal shell at saturated steam pressure to produce an asbestos free calcium silicate filler means; (d) baking said calcium silicate filler mass in said metal shell to form in said calcium silicate filler mass uniformly distributed very fine pores of less than about 25 microns and having a porosity of at least about 85 volume percent, the clearance between said metal shell and said asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass being less than about 1/8 inch.
Claim 16
Independent Claim
190 words
A method of forming an acetylene storage vessel having disposed therein an asbestos free, porous, heat hardened, monolithic calcium silicate filler mass comprising: (a) providing an asbestos free aqueous slurry comprising at least about 85 percent volume water, CaO and SiO 2 wherein the weight ratio of CaO to SiO 2 is about 0.6 to about 1.0, and having uniformly dispersed in the aqueous slurry at least about 0.5 weight percent, based on the solids in said slurry, of refractor carbon fibers; (b) pouring said asbestos free aqueous slurry composition into a metal shell so as to substantially fill said metal shell; (c) autoclaving said slurry in said metal shell at saturated steam pressure to produce an asbestos free calcium silicate filler means; (d) baking said calcium silicate filler mass in said metal shell to form in said calcium silicate filler mass uniformly distributed very fine pores of less than about 25 microns and having a porosity of at least about 85 volume percent, the clearance between said metal shell and said asbestos free, porous, heat hardened and dried monolithic calcium silicate filler mass being less than about 1/8 inch.
Claim 17
Dependent Claim
30 words
A method according to claim 13, wherein said refractory carbon fiber are present in said calcium silicate filler mass in amount of about 0.5 weight percent and 20 weight percent.
Claim 18
Dependent Claim
21 words
A method according to claim 13, wherein said calcium silicate filler mass has a crystalline phase of about 50 weight percent.
Claim 19
Dependent Claim
22 words
A method according to claim 13, wherein said refractory carbon fibers have a length of about 1/8 inch and about 3 inches.
Claim 20
Dependent Claim
22 words
A method according to claim 16, wherein said refractory carbon fibers have a diameter of about 5 microns and about 50 microns.
Claim 21
Dependent Claim
20 words
A method according to claim 13, wherein said calcium silicate filler mass has a porosity of about 90 volume percent.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |