US4482385A
Expired / Lapsed
US
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Cementitious composite material with stainless steel particulate filler
Assignee: RESEARCH ONE 500 VIRGINIA AVENUE TOWSON MD A Ltd PARTNERSHIP OF LP
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Filing: 1983-06-30
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Granted: 1984-11-13
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Expires: 2003-06-30
Abstract
Abstract A cementitious composite material exhibiting a unique combination of high strength, vacuum integrity and thermal properties. Objects made of the material may be cast from mixtures in which a major constituent is a filler which consists of stainless steel particles of particular shapes and sizes. The cast objects are characterized by the absence of a continuous network of interconnected pores and by the presence of a tobermorite phase in the material.
Inventors
- 👤 John A. Satkowski
- 👤 Barry Scheetz
- 👤 Janine M. Rizer
- 👤 Carl Gotzmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:10
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B14/00; C04B14/02; C04B14/34; C04B2103/00; C04B2103/30; C04B2103/32; C04B2103/50; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
18 words
A cementitious composite material which comprises Portland cement and irregularly shaped stainless steel particles as the principal filler.
Claim 2
Dependent Claim
18 words
A cementitious composite material which comprises Portland cement and irregularly shaped stainless steel particles as the principal filler.
Claim 3
Dependent Claim
26 words
A cementitious composite material which comprises Portland cement and irregularly shaped stainless steel particles as the principal filler and which is capable of holding a vacuum.
Claim 4
Dependent Claim
26 words
A cementitious composite material which comprises Portland cement and irregularly shaped stainless steel particles as the principal filler and which is capable of holding a vacuum.
Claim 5
Dependent Claim
42 words
The material of claim 2 having a thermal conductivity of between about 13 and about 19 BTU/IN/HR/Ft 2 /°F., a specific heat of between about 0.18 and 0.28 cal/G/°C. and a coefficient of thermal expansion between about 12 and 13.5×10 -6 /°K.
Claim 6
Dependent Claim
58 words
A mixture from which objects of a cementitious composite material may be cast, which exhibits high strength and vacuum integrity, said mixture comprising: a. Portland cement b. chemically active silica fume particles c. a less chemically active siliceous fine aggregate d. a superplasticizer e. an antifoam agent f. an irregularly shaped stainless steel particulate, filler and g. water.
Claim 7
Dependent Claim
58 words
A mixture from which objects of a cementitious composite material may be cast, which exhibits high strength and vacuum integrity, said mixture comprising: a. Portland cement b. chemically active silica fume particles c. a less chemically active siliceous fine aggregate d. a superplasticizer e. an antifoam agent f. an irregularly shaped stainless steel particulate, filler and g. water.
Claim 8
Dependent Claim
61 words
The mixture of claim 4 in which the constituents are present in the following relative proportions in % by weight of the mixture: a. Portland cement--20-33% b. chemically active silica fume--2-7% c. less active fine aggregates--5-25% d. superplasticizer--0.01-1.5% e. antifoam agent--0.01-0.5% f. metallic filler-- 10/25 mesh stainless steel up to 50% 80/100 mesh stainless steel up to 30%; and g. water--5-10%.
Claim 9
Dependent Claim
50 words
The mixture of claim 5 in which the relative proportions are approximately: a. Portland cement--24-25% b. chemically active silica fume--3-3.5% c. less active fine aggregate--10-12% d. superplasticizer--0.5% e. antifoam agent--0.25% f. metallic filler-- 10/25 mesh stainless steel up to 35% 80/100 mesh stainless steel up to 20%; and g. water--6-7%.
Claim 10
Dependent Claim
46 words
The mixture of claim 6 in which the relative proportions are approximately: a. Portland cement--24.28% b. chemically active silica fume--3.31% c. less active fine aggregate--11.82% d. superplasticizer--0.47% e. antifoam agent--0.01% f. metallic filler-- 10/25 mesh stainless steel 34.8% 80/100 mesh stainless steel 18.7%; and g. water--6.66%.
Claim 11
Dependent Claim
14 words
The mixture of claim 7 in which the Portland cement is API Class H.
Claim 12
Dependent Claim
20 words
The mixture of claim 5 in which the superplasticizer is sodium salt of formaldehyde condensate of naphthalene beta sulfonic acid.
Claim 13
Dependent Claim
13 words
The mixture of claim 5 in which the antifoam agent is Tri-n-butyl phosphate.
Claim 14
Dependent Claim
18 words
The mixture of claim 5 in which the irregularly shaped metallic filler is type 316 stainless steel particles.
Claim 15
Dependent Claim
22 words
The mixture of claim 5 in which the less active siliceous aggregate comprises particles of quartz or silica finer than 5 microns.
Claim 16
Independent Claim
115 words
A method of preparing cast objects of a cementitious composite material with high strength, vacuum integrity and good thermal properties and which are characterized by an absence of a continuous network of interconnected pores which comprises: a. preparing a blend of Portland cement and fine crystalline silica particles in a mixing vessel b. adding superplasticizer and an antifoam agent to produce a mixture thereof c. adding said mixture to said blend in said vessel, with stirring d. preparing a mixture of at least two different size fractions of stainless steel particles e. mixing said mixture of stainless steel particles into the contents of the mixing vessel; and f. casting the resulting material into an object.
Claim 17
Independent Claim
115 words
A method of preparing cast objects of a cementitious composite material with high strength, vacuum integrity and good thermal properties and which are characterized by an absence of a continuous network of interconnected pores which comprises: a. preparing a blend of Portland cement and fine crystalline silica particles in a mixing vessel b. adding superplasticizer and an antifoam agent to produce a mixture thereof c. adding said mixture to said blend in said vessel, with stirring d. preparing a mixture of at least two different size fractions of stainless steel particles e. mixing said mixture of stainless steel particles into the contents of the mixing vessel; and f. casting the resulting material into an object.
Claim 18
Dependent Claim
19 words
A cementitious object with high strength, vacuum integrity and good thermal properties prepared by the method of claim 13.
Claim 19
Dependent Claim
13 words
A cementitious object with vacuum integrity produced from the mixture of claim 5.
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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |