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US4778718A
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Fabric-reinforced cementitious sheet-like structures and their production
Assignee: DELAWARE A CORP OF DE, University of
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Filing: 1987-03-26
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Granted: 1988-10-18
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Expires: 2007-03-26
Abstract
Abstract A bendable thin, sheet-like structure having a cementitious matrix reinforced with a three-dimensional fabric of an organic fiber uniformly distributed throughout the thickness of the structure and a continuous process for its production.
Inventors
- 👤 Robert L. Nicholls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B28; B28B; B28B1/00; B28B1/52; B28B1/525; B28B19/00; B28B19/0092; B32B27/36; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/044; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0261; B32B2262/0269; B32B2262/0276; B32B2262/10; B32B2262/106; B32B2305/00; B32B2305/08; B32B2307/00; B32B2307/50; B32B2307/546; B32B2307/558; B32B2419/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T442/00; Y10T442/60; Y10T442/674; Y10T442/676; Y10T442/678
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A thin, sheet-like structure having: a cementitious matrix; reinforcement within the matrix consisting of a three-dimensional fabric of a ductile organic fiber distributed substantially uniformly throughout the structure at a volume ratio equal to or greater than the critical volume ratio, the pores of the fabric being sufficiently large to permit unhardened matrix to be screeded therethrough; and a continuous organic film adhered to at least one surface of the sheet-like structure.
Claim 2
Dependent Claim
72 words
A thin, sheet-like structure having: a cementitious matrix; reinforcement within the matrix consisting of a three-dimensional fabric of a ductile organic fiber distributed substantially uniformly throughout the structure at a volume ratio equal to or greater than the critical volume ratio, the pores of the fabric being sufficiently large to permit unhardened matrix to be screeded therethrough; and a continuous organic film adhered to at least one surface of the sheet-like structure.
Claim 3
Dependent Claim
18 words
The structure of claim 1 wherein the fabric has fibers selected from polyesters, polyolefins, aromatic polyamides, and carbon.
Claim 4
Dependent Claim
10 words
The structure of claim 1 wherein the fabric is nonwoven.
Claim 5
Dependent Claim
18 words
The structure of claim 3 wherein the fabric has fibers selected from polyester, polyolefins, aromatic polyamides, and carbon.
Claim 6
Dependent Claim
104 words
The continuous process of forming a continuous thin sheet-like structure with substantially no in-process hold-up time comprising, in sequence: adhering a continuous sheet of an organic backing to a continuous three-dimensional, nonwoven ductile fabric; applying a dry water-hardenable cementitious matrix material to the fabric layer, the organic backing preventing the material from going through the fabric layer; mechanically urging the matrix material into interstitial spaces of the fabric to cause the fibers to be uniformly dispersed throughout the dry layer of matrix material; wetting the layer of matrix material containing the fabric with a water spray; and thereafter allowing the water-wet structure to harden.
Claim 7
Dependent Claim
104 words
The continuous process of forming a continuous thin sheet-like structure with substantially no in-process hold-up time comprising, in sequence: adhering a continuous sheet of an organic backing to a continuous three-dimensional, nonwoven ductile fabric; applying a dry water-hardenable cementitious matrix material to the fabric layer, the organic backing preventing the material from going through the fabric layer; mechanically urging the matrix material into interstitial spaces of the fabric to cause the fibers to be uniformly dispersed throughout the dry layer of matrix material; wetting the layer of matrix material containing the fabric with a water spray; and thereafter allowing the water-wet structure to harden.
Claim 8
Dependent Claim
18 words
The process of claim 5 including the additional step of continuously forming the wetted structure into a roll.
Claim 9
Dependent Claim
8 words
The product of the process of claim 5.
Claim 10
Dependent Claim
12 words
The product of claim 7 in the form of a building material.
Claim 11
Dependent Claim
10 words
The product of claim 8 in the form of shingles.
Claim 12
Dependent Claim
14 words
The product of the process of claim 6 in the form of a roll.
References Cited (Backward Citations)
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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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |