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US3852930A Expired / Lapsed US ⏱️ 0.0 years remaining

Tridimensional fiber reinforcement of portland cement concrete matrices

Assignee: Massachusetts Institute of Technology
•
Filing: 1972-08-24
•
Granted: 1974-12-10
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Expires: 1992-08-24
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Abstract

Abstract Steel fibers or cloth made therefrom having a tridimensional configuration for use as a reinforcement for Portland cement concrete matrices is described. At least three wires, approximately equally laterally spaced from each other, skeletally enclose a volume in the approximate shape of a sphere or ellipsoid; the wires are joined to one another where they meet along the axis of the volume enclosed to form the basic tridimensional element termed an ''''enclosure''''. These enclosures may be connected in series by causing the wires to be sufficiently long to form two or more enclosures. One or more of serially connected enclosures may be used as a reinforcing fiber. A continuous fiber is formed by connecting in series a relatively large number of enclosures. A group of parallel, continuous fibers may be laterally connected to form a tridimensional cloth.

Inventors

  • 👤 A Naaman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 16:41
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/01; E04C5/02; E04C5/04; E04C5/012

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 71 words
A reinforcing fiber for a concrete matrix comprising a plurality of three or more steel wires, said wires forming a skeletal outline of a volumetric enclosure, said wires being substantially equally spaced from each other on said enclosure, said wires being joined together at opposite ends of the enclosure, an additional steel wire through the center of said volumetric enclosure, joining the other skeletal wires at the ends of the enclosures.
Claim 2
Dependent Claim 71 words
A reinforcing fiber for a concrete matrix comprising a plurality of three or more steel wires, said wires forming a skeletal outline of a volumetric enclosure, said wires being substantially equally spaced from each other on said enclosure, said wires being joined together at opposite ends of the enclosure, an additional steel wire through the center of said volumetric enclosure, joining the other skeletal wires at the ends of the enclosures.
Claim 3
Dependent Claim 38 words
The reinforcing fiber of claim 1 comprising, in addition, a plurality of said fibers, said fibers being serially connected at the ends where said wires are joined together to form a continuous fiber having a plurality of enclosures.
Claim 4
Dependent Claim 29 words
The reinforcing fiber of claim 2 wherein said wires forming a fiber enclosure are continued without being broken and formed into serially connected fiber enclosures called a continuous fiber.
Claim 5
Dependent Claim 37 words
The reinforcing fiber of claim 3 wherein the wires forming the fiber enclosures are twisted about one another in the region between the enclosures and at the ends of the continuous fiber to achieve the enclosures'' connections.
Claim 6
Dependent Claim 55 words
A reinforcing cloth comprising a plurality of continuous fibers as in claim 2 arranged in a parallel relation and spaced from each other, a plurality of wires substantially parallel and transverse to the direction of said continuous fibers, each wire of said plurality being connected to a continuous fiber to form a grid-like fiber cloth.
Claim 7
Dependent Claim 17 words
The fiber of claim 2 wherein said joined wires are wires that are twisted about each other.

References Cited (Backward Citations)

US906479A Cited
US1046913A Cited
US1124170A Cited
US2754674A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-09 1978-06-10 1978-12-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-09 1982-06-10 1982-12-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-09 1986-06-10 1986-12-10 $7700.00 Window Closed / Lapsed

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