US5865007A
Expired / Lapsed
US
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Integrally molded reinforced grating
Assignee: Composite Structures International Inc
•
Filing: 1997-10-27
•
Granted: 1999-02-02
•
Expires: 2017-10-27
Abstract
Abstract An integral reinforced resin grating structure having a plurality of load bars having a height dimension and a neutral axis and a plurality of cross bars integrally connected with said load bars. The cross bars may have a height less than the load bar height. The upper surface of the cross bars may be flush with the upper surface of the load bars. The lower surface of the cross bars may be located near or above the neutral axis of the load bars. The cross bars and load bars are reinforced with rovings placed along their respective longitudinal axis. The load bars have longitudinal rovings placed below the lower surface of the cross bars. Above the lower surface of the cross bars, the load bar rovings are interwoven with the cross bar rovings. For improved plastic reinforced grating structures having increased surface hardness and abrasion resistance, tabular alumina or other materials having a Mohs hardness of approximately 7 or higher may be added to the resin.
Inventors
- 👤 Steven J. Bowman
- 👤 Gregory S. Foskey
- 👤 Wendell W. Hollingsworth
- 👤 R. David Lee
- 👤 Ethan A. Love
- 👤 Kristin P. Mathis-Pierson
- 👤 James H. Randle
- 👤 Troy L. Truss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:37
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/427; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 70
Claim 1
Independent Claim
76 words
A reinforced resin grating comprising: a plurality of load bars having a height dimension, and an upper surface; a plurality of cross bars having an upper surface and a lower surface; said cross bars transversely connected to said load bars; at least one cross bar having a height less than said load bar's height; and said load bars having rovings along its longitudinal axis from its lower surface to the lower surface of said cross bar.
Claim 2
Dependent Claim
76 words
A reinforced resin grating comprising: a plurality of load bars having a height dimension, and an upper surface; a plurality of cross bars having an upper surface and a lower surface; said cross bars transversely connected to said load bars; at least one cross bar having a height less than said load bar's height; and said load bars having rovings along its longitudinal axis from its lower surface to the lower surface of said cross bar.
Claim 3
Dependent Claim
18 words
The grating of claim 1 wherein all said cross bars have a height less than said load bars.
Claim 4
Dependent Claim
26 words
The grating of claim 1 wherein said cross bars are integrally molded with said load bars whereby an integral grating structure is formed having no joints.
Claim 5
Dependent Claim
28 words
The grating of claim 1 wherein said upper surfaces of said load bars and said upper surfaces of said cross bars are flush with respect to each other.
Claim 6
Dependent Claim
25 words
The grating of claim 1 wherein the spacing of said cross bars is in the range of 2-5 times the spacing of the load bars.
Claim 7
Dependent Claim
40 words
The grating of claim 1 wherein said resin further comprises an additive selected from the group comprising: tabular alumina, quartz powder, tungsten carbide powder, ceramic powder, aluminum oxide powder or other material having a Mohs hardness of 7 or higher.
Claim 8
Dependent Claim
35 words
The grating of claim 1 wherein said load bars rovings loaded below the lower surface of the cross bars comprise in the range of 25% to 50% by weight of the total grating reinforcement content.
Claim 9
Dependent Claim
24 words
The grating of claim 5 wherein said cross bars longitudinal rovings are interwoven with said load bar rovings above said cross bar lower surface.
Claim 10
Dependent Claim
31 words
The grating of claim 1 wherein said resin is selected from the group comprising: vinyl ester, isophthalic polyester, orthopthalic polyester, terapthalic polyester, Modar, Dicyclopentenadione, novalac viny ester, and Bisphenol-A vinyl ester.
Claim 11
Dependent Claim
30 words
The grating of claim 1 wherein said cross bars have a cross sectional shape selected from the group comprising: rectangular, square, T-shaped, L-shaped, channel, Double taper, parabolic, m-shaped or I-shaped.
Claim 12
Dependent Claim
30 words
The grating of claim 1 wherein said load bars have a cross sectional shape selected from the group comprising: rectangular, square, T-shaped, L-shaped, channel, Double taper, parabolic, m-shaped or I-shaped.
Claim 13
Dependent Claim
31 words
The grating of claim 1 wherein said rovings are selected from the group comprising: kevlar, graphite, rayon, fiberglass, E glass, C glass, steel, nylon, tungston, boron, jute, hemp or carbon fiber.
Claim 14
Dependent Claim
17 words
The grating of claim 1 wherein said rovings have a yield in the range of 28-450 yards/pound.
Claim 15
Dependent Claim
35 words
The grating of claim 1 wherein said load bar rovings placed below the lower surface of the cross bars comprise in the range of 30% to 45% by weight of the total grating reinforcement content.
Claim 16
Dependent Claim
19 words
The grating of claim 1 wherein said rovings are tightly spaced below the lower surface of the cross bars.
Claim 17
Dependent Claim
25 words
The grating of claim 1 wherein said rovings comprise a total reinforcement content in the range of 20% to 55% of the total grating weight.
Claim 18
Dependent Claim
15 words
The grating of claim 1 wherein said load bars are perpendicular to said cross bars.
Claim 19
Dependent Claim
19 words
The grating of claim 1 wherein said rovings have a yield in the range of 56 to 225 yards/pound.
Claim 20
Dependent Claim
11 words
The grating of claim 1 comprising a thermoset or thermoplastic resin.
Claim 21
Dependent Claim
76 words
A reinforced resin grating comprising: a plurality of load bars having a height dimension, an upper surface and a neutral axis; a plurality of cross bars having a lower surface and an upper surface; a plurality of longitudinal rovings in said load bar placed below the neutral axis; said cross bars being transversely connected to said load bars; and at least one of said cross bars having its lower surface located at about said neutral axis.
Claim 22
Dependent Claim
76 words
A reinforced resin grating comprising: a plurality of load bars having a height dimension, an upper surface and a neutral axis; a plurality of cross bars having a lower surface and an upper surface; a plurality of longitudinal rovings in said load bar placed below the neutral axis; said cross bars being transversely connected to said load bars; and at least one of said cross bars having its lower surface located at about said neutral axis.
Claim 23
Dependent Claim
21 words
The grating of claim 20 wherein all said lower surfaces of said cross bars are located at about said neutral axis.
Claim 24
Dependent Claim
28 words
The grating of claim 20 wherein said cross bars are integrally molded with said load bars whereby an integral grating structure is formed having no joints or interfaces.
Claim 25
Dependent Claim
28 words
The grating of claim 20 wherein said upper surfaces of said load bars and said upper surfaces of said cross bars are flush with respect to each other.
Claim 26
Dependent Claim
25 words
The grating of claim 20 wherein the spacing of said cross bars is in the range of 2-5 times the spacing of the load bars.
Claim 27
Dependent Claim
40 words
The grating of claim 20 wherein said resin further comprises an additive selected from the group comprising: tabular alumina, quartz powder, tungsten carbide powder, ceramic powder, aluminum oxide powder or other material having a Mohs hardness of 7 or higher.
Claim 28
Dependent Claim
34 words
The grating of claim 20 wherein said load bar rovings loaded below the lower surface of the cross bars comprise in the range of 25% to 50% by weight of the total reinforcement content.
Claim 29
Dependent Claim
24 words
The grating of claim 5 wherein said cross bars longitudinal rovings are interwoven with said load bar rovings above said cross bar lower surface.
Claim 30
Dependent Claim
31 words
The grating of claim 20 wherein said resin is selected from the group comprising: vinyl ester, isophthalic polyester, orthopthalic polyester, terapthalic polyester, Modar, Dicyclopentenadione, novalac viny ester, and Bisphenol-A vinyl ester.
Claim 31
Dependent Claim
30 words
The grating of claim 20 wherein said cross bars have a cross sectional shape selected from the group comprising: rectangular, square, T-shaped, L-shaped, channel, Double taper, parabolic, m-shaped or I-shaped.
Claim 32
Dependent Claim
30 words
The grating of claim 20 wherein said load bars have a cross sectional shape selected from the group comprising: rectangular, square, T-shaped, L-shaped, channel, Double taper, parabolic, m-shaped or I-shaped.
Claim 33
Dependent Claim
31 words
The grating of claim 20 wherein said rovings are selected from the group comprising: kevlar, graphite, rayon, fiberglass, E glass, C glass, steel, nylon, tungston, boron, jute, hemp or carbon fiber.
Claim 34
Dependent Claim
17 words
The grating of claim 20 wherein said rovings have a yield in the range of 28-450 yards/pound.
Claim 35
Dependent Claim
34 words
The grating of claim 20 wherein said load bar rovings loaded below the lower surface of the cross bars comprise in the range of 30% to 45% by weight of the total reinforcement content.
Claim 36
Dependent Claim
19 words
The grating of claim 20 wherein said rovings are tightly spaced below the lower surface of the cross bars.
Claim 37
Dependent Claim
25 words
The grating of claim 20 wherein said rovings comprise a total reinforcement content in the range of 20% to 55% of the total grating weight.
Claim 38
Dependent Claim
15 words
The grating of claim 20 wherein said load bars are perpendicular to said cross bars.
Claim 39
Dependent Claim
19 words
The grating of claim 20 wherein said reinforcement has a yield in the range of 56 to 225 yards/pounds.
Claim 40
Dependent Claim
12 words
The grating of claim 20 wherein said resin is thermoset or thermoplastic.
Claim 41
Dependent Claim
21 words
The grating of claim 20 wherein said cross bar height is less than half the height of the load bar height.
Claim 42
Dependent Claim
74 words
An integrally molded reinforced resin grating comprising: a plurality of load bars having an upper surface and a neutral axis; a plurality of cross bars having a lower surface and an upper surface; a plurality of longitudinal rovings in said load bars placed below the neutral axis; said cross bars being transversely connected with said load bars; and at least one of said cross bars having its lower surface located above said neutral axis.
Claim 43
Dependent Claim
74 words
An integrally molded reinforced resin grating comprising: a plurality of load bars having an upper surface and a neutral axis; a plurality of cross bars having a lower surface and an upper surface; a plurality of longitudinal rovings in said load bars placed below the neutral axis; said cross bars being transversely connected with said load bars; and at least one of said cross bars having its lower surface located above said neutral axis.
Claim 44
Dependent Claim
20 words
The grating of claim 40 wherein all of said cross bars have their lower surface located above said neutral axis.
Claim 45
Dependent Claim
26 words
The grating of claim 40 wherein said cross bars are integrally molded with said load bars whereby an integral grating structure is formed having no joints.
Claim 46
Dependent Claim
28 words
The grating of claim 40 wherein said upper surfaces of said load bars and said upper surfaces of said cross bars are flush with respect to each other.
Claim 47
Dependent Claim
25 words
The grating of claim 40 wherein the spacing of said cross bars is in the range of 2-5 times the spacing of the load bars.
Claim 48
Dependent Claim
39 words
The grating of claim 40 wherein said resin contains an additive selected from the group comprising: tabular alumina, quartz powder, tungsten carbide powder, ceramic powder, aluminum oxide powder or other material having a Mohs hardness of 7 or higher.
Claim 49
Dependent Claim
34 words
The grating of claim 40 wherein said load bar rovings placed below the lower surface of the cross bars comprise in the range of 25% to 50% by weight of the total reinforcement content.
Claim 50
Dependent Claim
24 words
The grating of claim 40 wherein said cross bars have longitudinal rovings interwoven with said load bar rovings above said cross bar lower surface.
Claim 51
Dependent Claim
31 words
The grating of claim 40 wherein said resin is selected from the group comprising: vinyl ester, isophthalic polyester, orthopthalic polyester, terapthalic polyester, Modar, Dicyclopentenadione, novalac viny ester, and Bisphenol-A vinyl ester.
Claim 52
Dependent Claim
30 words
The grating of claim 40 wherein said cross bars have a cross sectional shape selected from the group comprising: rectangular, square, T-shaped, L-shaped, channel, Double taper, parabolic, m-shaped or I-shaped.
Claim 53
Dependent Claim
30 words
The grating of claim 40 wherein said load bars have a cross sectional shape selected from the group comprising: rectangular, square, T-shaped, L-shaped, channel, Double taper, parabolic, m-shaped or I-shaped.
Claim 54
Dependent Claim
31 words
The grating of claim 40 wherein said rovings are selected from the group comprising: kevlar, graphite, rayon, fiberglass, E glass, C glass, steel, nylon, tungston, boron, jute, hemp or carbon fiber.
Claim 55
Dependent Claim
17 words
The grating of claim 40 wherein said rovings have a yield in the range of 28-450 yards/pound.
Claim 56
Dependent Claim
32 words
The grating of claim 40 wherein said rovings located below the lower surface of the cross bars comprise in the range of 30% to 45% by weight of the total reinforcement content.
Claim 57
Dependent Claim
19 words
The grating of claim 40 wherein said rovings are tightly spaced below the lower surface of the cross bars.
Claim 58
Dependent Claim
25 words
The grating of claim 40 wherein said rovings comprise a total reinforcement content in the range of 20% to 55% of the total grating weight.
Claim 59
Dependent Claim
15 words
The grating of claim 40 wherein said load bars are perpendicular to said cross bars.
Claim 60
Dependent Claim
19 words
The grating of claim 40 wherein said reinforcement has a yield in the range of 56 to 225 yards/pound.
Claim 61
Dependent Claim
12 words
The grating of claim 40 wherein said resin is thermoset or thermoplastic.
Claim 62
Dependent Claim
21 words
The grating of claim 40 wherein said cross bar height is less than half the height of the load bar height.
Claim 63
Dependent Claim
75 words
A reinforced resin grating comprising: a plurality of load bars; a plurality of cross bars transversely connected with said load bars; said cross bars and said load bars having longitudinal reinforcement; said cross bar reinforcement interwoven with said load bar reinforcement; and said resin comprising an additive selected from the group comprising: tabular alumina, quartz powder, tungsten carbide powder, ceramic powder, aluminum oxide powder or other material having a Mohs hardness of 7 or higher.
Claim 64
Dependent Claim
75 words
A reinforced resin grating comprising: a plurality of load bars; a plurality of cross bars transversely connected with said load bars; said cross bars and said load bars having longitudinal reinforcement; said cross bar reinforcement interwoven with said load bar reinforcement; and said resin comprising an additive selected from the group comprising: tabular alumina, quartz powder, tungsten carbide powder, ceramic powder, aluminum oxide powder or other material having a Mohs hardness of 7 or higher.
Claim 65
Dependent Claim
25 words
The grating of claim 60 wherein said additive comprises in the range of about 5% to about 30% by weight of the total resin mixture.
Claim 66
Dependent Claim
25 words
The grating of claim 60 wherein said additive comprises in the range of about 5% to about 20% by weight of the total resin mixture.
Claim 67
Dependent Claim
25 words
The grating of claim 60 wherein said additive comprises in the range of about 5% to about 15% by weight of the total resin weight.
Claim 68
Dependent Claim
21 words
The grating of claim 60 wherein said additive has a mesh size in the range of about 250 to about 350.
Claim 69
Dependent Claim
21 words
The grating of claim 60 wherein said additive has a mesh size in the range of about 275 to about 350.
Claim 70
Dependent Claim
21 words
The grating of claim 60 wherein said additive has a mesh size in the range of about 300 to about 325.
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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) | 2002-02-01 | 2002-08-03 | 2003-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-01 | 2006-08-03 | 2007-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-01 | 2010-08-03 | 2011-02-02 | $7700.00 | Window Closed / Lapsed |