US3762981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick release safety windshield
Assignee: SAINT GOBAIN BOULEVARD V NEUIL
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Filing: 1971-03-15
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Granted: 1973-10-02
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Expires: 1991-03-15
Abstract
Abstract A quick release windshield is constructed of a thin sheet of glass, an interlayer of poly-vinyl butyral and a surface layer of a cellulose aceto-butyrate or cellulose tripropionate. The cellulose ester is preferably mounted on the butyral by means of a transparent adhesion-promoter such as tin-II-chloride. For use in places where the organic layer is apt to be marred, its surface is hardened by the application of a coating of an organic polysiloxane. The glass projects beyond the organic layers and serves as the only major mounting means.
Inventors
- 👤 K Blank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:32
CPC Classifications
B; B32; B32B; B32B23/00; B32B23/04; B32B23/08; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/10165; B32B17/1033; B32B17/1055; B32B17/10688; B32B17/10761; B32B23/20; B32B27/00; B32B27/30; B32B27/306; B32B2307/00; B32B2307/50; B32B2307/554; B32B2317/00; B32B2317/18; B32B2329/00; B32B2329/06; B32B2605/00; B32B2605/006; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24752; Y10T428/26; Y10T428/31504; Y10T428/31551; Y10T428/31627; Y10T428/3163; Y10T428/31652; Y10T428/31663; Y10T428/31942; Y10T428/31949; Y10T428/31953
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
21 words
A windshield according to claim 1, and a coating of organo-polysiloxane on the otherwise exposed surface of the cellulose ester layer.
Claim 2
Dependent Claim
29 words
A windshield according to claim 1 in which the polyvinyl butyral and cellulose ester layers have dimensions which leave a rim of the glass sheet projecting beyond their edges.
Claim 3
Dependent Claim
34 words
A windshield according to claim 3 in which the layer of cellulose ester is about 0.2 to about 0.5 mm. thick and the polyvinyl butyral layer has a minimum thickness of about 0.7 mm.
Claim 4
Dependent Claim
64 words
A windshield which consists essentially of an exterior first layer of glass, a transparent cellulosic ester second layer selected from the group consisting of cellulose aceto-butyrate, cellulose aceto-propionate and cellulose tripropionate and a third layer of polyvinyl butyral interposed between and adhered to said first and second layers, said second and third layers being superposed and essentially covering one surface of said first layer.
Claim 5
Dependent Claim
43 words
A windshield according to claim 5 in which said glass layer projects a limited distance beyond the periphery of said second and third layers, and a mounting frame surrounding the windshield and attached essentially solely to the projecting portion of said glass layer.
Claim 6
Dependent Claim
47 words
A windshield according to claim 5 in which said second and third layers are adhered by means of a solution in alcohol of an adhesion promoter selected from tin chloride, gamma-aminopropyltriethoxysilane and gamma-glycidoxypropyltrimethoxysilane applied to at least one of the interfaces of said second and third layers.
Claim 7
Independent Claim
83 words
The method of adhesively joining the organic layers of a laminated windshield comprising a first outer layer of glass, an interlayer of polyvinyl butyral, and a second outer layer selected from the group consisting of cellulose aceto-butyrate, cellulose aceto-propionate and cellulose tripropionate, which comprises coating with an alcoholic solution of one of the substances selected from the group of tin-II-chloride, gamma-aminopropyltriethoxysilane and gamma-glycidoxypropyltrimethoxysilane at least one of the interfaces between the interlayer and the second layer, and heating and pressing together the interfaces.
Claim 8
Dependent Claim
19 words
The method of claim 8, and coating the exposed face of the second outer layer with an organo polysiloxane.
Claim 9
Independent Claim
101 words
A method of making a safety windshield which comprises, adhesively connecting in superposed relation an interlayer of polyvinyl butyral, a first outer layer of glass and a second outer layer selected from the group consisting of cellulose acetO-butyrate, cellulose aceto-propionate and cellulose tripropionate, the interlayer and second layer having peripheral dimensions less than those of the first layer, thereby providing a projecting rim of uncovered glass for attachment to a mounting frame, and coating the interfaces of the cellulosic second layer and the polyvinyl butyral interlayer with an adhesion promotor selected from the group consisting of tin chloride, gamma-aminopropyltriethoxysilane and gamma-glycidoxypropyltrimethoxysilane.
Claim 10
Dependent Claim
24 words
A method according to claim 10 having the added step of coating the outer face of the second outer layer with an organo polysiloxane.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |