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Patent US4608089A successfully refreshed from Google Patents.
US4608089A
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Cement matrix composites and method of making same
Assignee: EIDP Inc
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Filing: 1985-07-19
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Granted: 1986-08-26
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Expires: 2005-07-19
Abstract
Abstract Cement matrix composites of improved flexural toughness are prepared with polyethylene fibrids of high orientation from plexifilamentary structures as reinforcement.
Inventors
- 👤 David M. Gale
- 👤 Hyunkook Shin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:22
CPC Classifications
C; C04; C04B; C04B16/00; C04B16/04; C04B16/06; C04B16/0608; C04B28/00; C04B28/02; C04B28/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A method for preparing a cement matrix composite reinforced at least in part with polyethylene pulp which comprises, making an aqueous slurry of Portland cement and a pulp of oriented polyethylene fibrids having a birefringence of at least about 0.030 and prepared from a plexifilamentary structure, depositing the slurry on a porous surface, dewatering the slurry and curing the composite.
Claim 2
Independent Claim
60 words
A method for preparing a cement matrix composite reinforced at least in part with polyethylene pulp which comprises, making an aqueous slurry of Portland cement and a pulp of oriented polyethylene fibrids having a birefringence of at least about 0.030 and prepared from a plexifilamentary structure, depositing the slurry on a porous surface, dewatering the slurry and curing the composite.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the fibrids constitute from 0.1 to 10% by wt. of the composite.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the fibrids constitute form 2 to 8% by wt. of the composite.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein from about 0.1 to 10% by wt. of staple fiber is added.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein from about 1 to 10% by wt. of cellulose pulp is added.
Claim 7
Dependent Claim
35 words
A cement matrix composite reinforced at least in part with a pulp of oriented polyethylene having a birefringence of at least about 0.030, said pulp constituting from 0.1 to 10% by weight of the composite.
Claim 8
Dependent Claim
35 words
A cement matrix composite reinforced at least in part with a pulp of oriented polyethylene having a birefringence of at least about 0.030, said pulp constituting from 0.1 to 10% by weight of the composite.
Claim 9
Dependent Claim
14 words
The composite of claim 6 wherein the pulp is prepared from a plexifilamentary structure.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |