Patent US5227241A successfully refreshed from Google Patents.
US5227241A
Expired / Lapsed
US
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Laminated glass
Assignee: Saint Gobain Glass France SAS
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Filing: 1992-04-09
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Granted: 1993-07-13
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Expires: 2012-04-09
Abstract
Abstract The present invention relates to a laminated glass, more specifically to an airplane windshield. The present laminated glass offers excellent resistance to breakage, and particularly, to cleavage of the sheets of glass from plastic layer(s) laminated therewith.
Inventors
- 👤 Pierre Chaussade
- 👤 Yves Naoumenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:46
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/14; B32B37/144; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10036; B32B17/10045; B32B17/10128; B32B17/10137; B32B17/1055; B32B17/10761; B32B27/00; B32B27/18; B32B27/22; B32B27/30; B32B27/306; B32B2250/00; B32B2250/05; B32B2329/00; B32B2329/06; B32B2605/00; B32B2605/006; B32B2605/18; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24983; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/31627; Y10T428/3163; Y10T428/31855; Y10T428/31859
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
211 words
A laminated glass, comprising i) a first sheet of glass having a length and a width; ii) a polyvinyl butyral (PVB) insert layered thereon having a length not greater than said length of said first sheet of glass and a width not greater than said width of said first sheet of glass, wherein said PVB insert comprises a) a first surface PVB layer attached to said first sheet of glass; b) a first inner PVB layer attached to said first surface PVB layer; and c) a second surface PVB layer attached to said first inner PVB layer; and iii) a second sheet of glass having a length not greater than said length of said first sheet of glass and a width not greater than said width of said first sheet of glass; wherein each PVB layer comprises a PVB resin and a plasticizer, wherein the ratio of the proportion of said plasticizer of said at least one of said first and second surface PVB layers and said proportion of said plasticizer of said first inner PVB layer being from 1.2:1 to 3:1; wherein said proportion of said plasticizer of said first inner layer is from 15 to 25 parts by weight of plasticizer per 100 parts by weight of PVB resin.
Claim 2
Dependent Claim
211 words
A laminated glass, comprising i) a first sheet of glass having a length and a width; ii) a polyvinyl butyral (PVB) insert layered thereon having a length not greater than said length of said first sheet of glass and a width not greater than said width of said first sheet of glass, wherein said PVB insert comprises a) a first surface PVB layer attached to said first sheet of glass; b) a first inner PVB layer attached to said first surface PVB layer; and c) a second surface PVB layer attached to said first inner PVB layer; and iii) a second sheet of glass having a length not greater than said length of said first sheet of glass and a width not greater than said width of said first sheet of glass; wherein each PVB layer comprises a PVB resin and a plasticizer, wherein the ratio of the proportion of said plasticizer of said at least one of said first and second surface PVB layers and said proportion of said plasticizer of said first inner PVB layer being from 1.2:1 to 3:1; wherein said proportion of said plasticizer of said first inner layer is from 15 to 25 parts by weight of plasticizer per 100 parts by weight of PVB resin.
Claim 3
Dependent Claim
17 words
The laminated glass of claim 1, wherein said first and second sheets of glass are chemically tempered.
Claim 4
Dependent Claim
67 words
The laminated glass of claim 1, wherein said proportion of said plasticizer in said one of said first and second surface PVB layers is from 30 to 45 parts by weight per 100 parts by weight of PVB resin, and said proportion of said plasticizer of said inner layer is from 15 to 25 parts by weight of plasticizer per 100 parts by weight of PVB resin.
Claim 5
Dependent Claim
59 words
The laminated glass of claim 1, wherein second surface PVB layer contains said plasticizer in a proportion higher than the proportion of plasticizer in said first inner PVB layer, the ratio of said proportion of said plasticizer of said second surface PVB layer and said proportion of said plasticizer of said first inner layer being from 1.2:1 to 3:1.
Claim 6
Dependent Claim
30 words
The laminated glass of claim 4, wherein said proportion of plasticizer in said first surface PVB layer is equal to said proportion of plasticizer in said second surface PVB layer.
Claim 7
Dependent Claim
114 words
The laminated glass of claim 4, wherein said PVB insert further comprises a second inner PVB layer between said first surface PVB layer and said first inner PVB layer, and a third inner PVB layer between said first inner PVB layer and said second surface PVB layer, the proportion of plasticizer in said second inner PVB layer being between said proportion of plasticizer in said first surface PVB layer and said proportion of plasticizer in said first inner PVB layer, and the proportion of plasticizer in said third inner PVB layer being between said proportion of plasticizer in said second surface PVB layer and said proportion of plasticizer in said first inner PVB layer.
Claim 8
Dependent Claim
66 words
The laminated glass of claim 3, wherein said proportion of plasticizer in said first and second surface PVB layers is from 35 to 42 parts by weight of plasticizer per 100 parts by weight of PVB resin, and said proportion of plasticizer in said first inner PVB layer is from 17 to 22 parts by weight of plasticizer per 100 parts by weight of PVB resin.
Claim 9
Dependent Claim
51 words
The laminated glass of claim 4, wherein each of said first and second surface PVB layers and said first inner PVB layer have a thickness, the ratio of said thickness of each of said first and second surface PVB layers and said first inner PVB layer being from 0.05:1 to 1:1.
Claim 10
Dependent Claim
196 words
The laminated glass of claim 1, further comprising a second PVB insert layered on said second sheet of glass, wherein said second PVB insert comprises a third surface PVB layer attached to said second sheet of glass, and a fourth inner PVB layer attached to said third surface PVB layer, each of said third surface PVB layer and fourth inner PVB layer comprising a PVB resin and a plasticizer, said third surface PVB layer containing said plasticizer in a proportion higher than the proportion of plasticizer in said fourth inner PVB layer, the ratio of said proportion of said plasticizer of said third surface PVB layer and said proportion of said plasticizer of said fourth inner PVB layer being from 1.2:1 to 3:1, said length of said second PVB insert being not greater than said length of said first sheet of glass and said width of said second PVB insert being not greater than said width of said first sheet of glass, and a third sheet of glass having a length not greater than said length of said first sheet of glass and a width not greater than said width of said first sheet of glass.
Claim 11
Dependent Claim
32 words
The laminated glass of claim 1, wherein said plasticizer is selected from the group consisting of dialkyl adipates, mixed alkyl adipates, alkyl aryl adipates, carboxylic acid esters of glycols, and mixtures thereof.
Claim 12
Dependent Claim
91 words
The laminated glass of claim 10, wherein said plasticizer is selected from the group consisting of di(C 1 -C 6 )esters of adipic acid, di(C 7 -C 16 )esters of adipic acid, mixed (C 1 -C 16 )esters of adipic acid, alkyl aryl adipates, di(C 1 -C 6 )carboxylic acid esters of ethylene glycol, di(C 7 -C 16 )carboxylic acid esters of ethylene glycol, mixed (C 1 -C 16 )carboxylic acid esters of ethylene glycol, di- or mixed (C 1 -C 16 )carboxylic acid esters of propylene glycol, and mixtures thereof.
Claim 13
Dependent Claim
65 words
The laminated glass of claim 1, further comprising at least one ring of a plastic material in marginal areas of said glass, said ring being interposed between said first inner PVB layer and either of said first surface PVB layer or said second surface PVB layer, said ring having a lower shear modulus and a superior elongation at break than said first inner PVB layer.
Claim 14
Dependent Claim
30 words
The laminated glass of claim 12, wherein either of said first surface PVB layer or said second surface PVB layer overlaps said ring in said marginal areas of said glass.
Claim 15
Dependent Claim
15 words
The laminated glass of claim 12, wherein said ring has a width of ≦20 cm.
Claim 16
Dependent Claim
13 words
The laminated glass of claim 12, wherein said ring comprises a thermoplastic polyurethane.
Claim 17
Dependent Claim
14 words
The laminated glass of claim 12, wherein said ring has a chamfered inner edge.
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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) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |