US4050949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforcing material for concrete
Assignee: SKF Nova AB
•
Filing: 1975-11-24
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Granted: 1977-09-27
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Expires: 1995-11-24
Abstract
Abstract An improved reinforcing material for concrete and comprising a multitude of relatively short and substantially straight steel flakes. The steel flakes are of a shape tapering towards the ends of the flakes, and they have a thickness of about 0.1 mm to about 0.5 mm, a maximum width of at least about ten times the thickness, but at least about 2 mm, and a length of at least about 100 times the thickness. They are intended to be uniformly distributed and in principle randomly orientated in the concrete. The most preferred dimensions are: thickness 0.1 to 0.2 mm, maximum width 4 to 6 mm, and length 20 to 80 mm.
Inventors
- 👤 Bengt G. S. Lundgren
- 👤 Sture B. G. Ostling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:45
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/01; E04C5/012; C; C04; C04B; C04B14/00; C04B14/005; C04B14/02; C04B14/34; Y; Y10; Y10S; Y10S75/00; Y10S75/954; Y10T; Y10T428/00; Y10T428/12; Y10T428/1241; Y10T428/12431
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
91 words
A reinforcing material for concrete said material being a multitude of short and substantially straight steel reinforcing elements of substantially rectangular cross section and small thickness in relation to their length and width, intended to be uniformly distributed and randomly orientated in the concrete, characterized in that the elements are relatively difficult to crush steel flakes with a shape tapering towards the ends of the flakes, said flakes having a thickness of from about 0.1 mm to about 0.5 mm and a length of at least about 100 times the thickness.
Claim 2
Dependent Claim
91 words
A reinforcing material for concrete said material being a multitude of short and substantially straight steel reinforcing elements of substantially rectangular cross section and small thickness in relation to their length and width, intended to be uniformly distributed and randomly orientated in the concrete, characterized in that the elements are relatively difficult to crush steel flakes with a shape tapering towards the ends of the flakes, said flakes having a thickness of from about 0.1 mm to about 0.5 mm and a length of at least about 100 times the thickness.
Claim 3
Dependent Claim
18 words
A reinforcing material according to claim 1, characterized in that the thickness is at most about 0.2 mm.
Claim 4
Dependent Claim
43 words
A reinforcing material according to claim 1, characterized in that the steel flakes have a maximum width of at least about ten times the thickness, but at least about 2 mm, said maximum width being at least about one tenth of the length.
Claim 5
Dependent Claim
25 words
A reinforcing material according to claim 3, characterized in that the maximum width is at most about 15 mm, preferably at most about 8 mm.
Claim 6
Dependent Claim
25 words
A reinforcing material according to claim 4, characterized in that the maximum width is at least about 4 mm and at most about 6 mm.
Claim 7
Dependent Claim
28 words
A reinforcing material according to claim 1, characterized in that the length of the steel flakes is at least about 20 mm and at most about 80 mm.
Claim 8
Dependent Claim
19 words
A reinforcing material according to claim 1, characterized in that the surface of the steel flakes is relatively rough.
Claim 9
Dependent Claim
20 words
A reinforcing material according to claim 1, characterized in that the steel flakes are twisted into a slight propeller shape.
Claim 10
Dependent Claim
20 words
A reinforcing material according to claim 1 characterized in that the material in the steel flakes has direction-independent strength properties.
Claim 11
Dependent Claim
28 words
A reinforcing material according to claim 1, characterized in that at least a major proportion of the steel flakes are joined together to form a three-dimensional, open structure.
Claim 12
Dependent Claim
27 words
A pourable concrete mix, comprising the reinforcing material as claimed in claim 1, in sufficient quantities to produce a reinforced concrete product upon hardening of the concrete.
Claim 13
Dependent Claim
19 words
A reinforced concrete product, comprising the reinforcing material as claimed in claim 1 uniformly distributed and randomly orientated therein.
References Cited (Backward Citations)
US3151971A
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US3429094A
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US3716386A
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US3650785A
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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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |