US4537633A
Expired / Lapsed
US
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Portland cement, process for preparing same, and compositions containing same
Assignee: SUH KYUNG SUK 506
•
Filing: 1983-06-10
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Granted: 1985-08-27
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Expires: 2003-06-10
Abstract
Abstract An improved Portland cement composition and process for producing same comprising dry powder of Portland cement and very fine particles of carbon black, wherein the dry powder of Portland cement is coated with an asphalt film prior to the addition of the carbon black.
Inventors
- 👤 Won P. Hong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:55
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B20/1044
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
25 words
A Portland cement composition comprising (1) dry powder of Portland cement, whose surface is coated with an asphalt film, and (2) particles of carbon black.
Claim 2
Dependent Claim
25 words
A Portland cement composition comprising (1) dry powder of Portland cement, whose surface is coated with an asphalt film, and (2) particles of carbon black.
Claim 3
Dependent Claim
21 words
A Portland cement composition as in claim 1, wherein said asphalt film comprises a film of straight asphalt or blown asphalt.
Claim 4
Dependent Claim
13 words
A concrete composition comprising the Portland cement composition of claim 2, and aggregates.
Claim 5
Dependent Claim
18 words
A Portland cement composition as in claim 2, wherein said asphalt has a softening point between 40°-90° C.
Claim 6
Dependent Claim
13 words
A concrete composition comprising the Portland cement composition of claim 4, and aggregates.
Claim 7
Dependent Claim
22 words
A Portland cement composition as in claim 4, wherein said asphalt is present in an amount of 0.2 to 1% by weight.
Claim 8
Dependent Claim
13 words
A concrete composition comprising the Portland cement composition of claim 6, and aggregates.
Claim 9
Dependent Claim
21 words
A Portland cement composition as in claim 1, wherein said carbon black has a particle diameter of 70 millimicrons or less.
Claim 10
Dependent Claim
13 words
A concrete composition comprising the Portland cement composition of claim 8, and aggregates.
Claim 11
Dependent Claim
23 words
A Portland cement composition as in claim 5, wherein said carbon black is present in an amount of 0.2 to 1.5% by weight.
Claim 12
Dependent Claim
13 words
A concrete composition comprising the Portland cement composition of claim 10, and aggregates.
Claim 13
Dependent Claim
25 words
A Portland cement composition as in claim 1, wherein gypsum is present in said Portland cement in an amount of 2 to 5% by weight.
Claim 14
Dependent Claim
13 words
A concrete composition comprising the Portland cement composition of claim 12, and aggregates.
Claim 15
Dependent Claim
13 words
A concrete composition comprising the Portland cement composition of claim 1, and aggregates.
Claim 16
Independent Claim
72 words
A method for preparing a Portland cement composition comprising the steps of: (a) adding molten or powdered asphalt to a dry powder of Portland cement; (b) heating and agitating the mixture of step (a) at 100° to 150° C.; (c) cooling the product of step (b) to room temperature; (d) admixing the resulting asphalt filmed Portland cement particles of step (c) with carbon black and agitating until a homogeneous mixture is produced.
Claim 17
Independent Claim
72 words
A method for preparing a Portland cement composition comprising the steps of: (a) adding molten or powdered asphalt to a dry powder of Portland cement; (b) heating and agitating the mixture of step (a) at 100° to 150° C.; (c) cooling the product of step (b) to room temperature; (d) admixing the resulting asphalt filmed Portland cement particles of step (c) with carbon black and agitating until a homogeneous mixture is produced.
Claim 18
Dependent Claim
33 words
A method for producing a Portland cement composition as in claim 15, wherein said asphalt is straight asphalt and said heating and agitating in step (b) is conducted at 100° to 120° C.
Claim 19
Dependent Claim
33 words
A method of producing a Portland cement composition as in claim 15, wherein said asphalt is blown asphalt and said heating and agitating in step (b) is conducted at 130° to 150° C.
Claim 20
Dependent Claim
33 words
A method for producing a Portland cement composition as in claim 15, wherein gypsum is present in the dry powder of Portland cement of step (a) prior to the addition of said asphalt.
References Cited (Backward Citations)
US2210367A
Cited
US2198800A
Cited
GB534731A
Cited
US2609882A
Cited
US3010840A
Cited
US3713856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |