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US4605443A
Expired / Lapsed
US
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CaO-Al2 O3 -SiO2 glass hydraulic cements
Assignee: Corning Glass Works
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Filing: 1985-01-28
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Granted: 1986-08-12
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Expires: 2005-01-28
Abstract
Abstract This invention relates to the preparation of hydraulic cements consisting essentially of glasses having compositions within area ABCDEA of FIG. 1 which, when contacted with water, hydrate to form strong, low porosity cements having crystals composed predominantly of hydrogarnet solid solution and/or hydrogehlenite.
Inventors
- 👤 John F. MacDowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:47
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
A hydraulic cement comprising a glass consisting essentially of a composition included within area ABCDEA of FIG. 1.
Claim 2
Dependent Claim
18 words
A hydraulic cement comprising a glass consisting essentially of a composition included within area ABCDEA of FIG. 1.
Claim 3
Dependent Claim
29 words
A hydraulic cement according to claim 1 which, when contacted with water, hydrates to form crystals composed predominantly of hydrogarnet solid solution and/or hydrogehlenite with essentially no subsequent conversion.
Claim 4
Dependent Claim
43 words
A hydraulic cement according to claim 1 exhibiting exceptionally high strength and low internal porosity having a composition approximating the C 3 A--SiO 2 join from about 20-24% SiO 2 which, when contacted with water, hydrates to form crystals composed predominantly of hydrogehlenite.
Claim 5
Dependent Claim
48 words
A hydraulic cement according to claim 1 exhibiting exceptionally high strength and low internal porosity having a composition consisting essentially of about 16-21% SiO 2 , 35-38% Al 2 O 3 , and 43-47% CaO which, when contacted with water, hydrates to form crystals composed predominantly of hydrogehlenite.
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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |