US4230771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl butyral laminates with tetraethyleneglycol di-n-heptanoate plasticizer
Assignee: EIDP Inc
•
Filing: 1979-08-31
•
Granted: 1980-10-28
•
Expires: 1999-08-31
Abstract
Abstract Laminates of glass and polyvinyl butyral plasticized with tetraethyleneglycol di-n-heptanoate.
Inventors
- 👤 Thomas R. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:35
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10816; B32B17/1055; B32B17/10761; C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/103; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31627; Y10T428/3163
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
40 words
A laminar structure comprising at least one layer of glass and a layer of a plastic composition comprising polyvinyl butyral and, in compatible admixture therewith, a plasticizer comprising at least about 10 weight percent tetraethyleneglycol di-n-heptanoate of the formula: ##STR4##
Claim 2
Dependent Claim
40 words
A laminar structure comprising at least one layer of glass and a layer of a plastic composition comprising polyvinyl butyral and, in compatible admixture therewith, a plasticizer comprising at least about 10 weight percent tetraethyleneglycol di-n-heptanoate of the formula: ##STR4##
Claim 3
Dependent Claim
25 words
A laminar structure of claim 1 wherein the polyvinyl butyral has a hydroxyl content of about from 15 to 30 percent calculated as polyvinyl alcohol.
Claim 4
Dependent Claim
26 words
A laminar structure of claim 2 wherein the polyvinyl butyral has a hydroxyl content of about from 20 to 25 weight percent, calculated as polyvinyl alcohol.
Claim 5
Dependent Claim
30 words
A laminar structure of claim 1 wherein the plasticizer consists essentially of tetraethyleneglycol di-n-heptanoate in a quantity of about from 20 to 55 parts parts per hundred of polyvinyl butyral.
Claim 6
Dependent Claim
26 words
A laminar structure of claim 4 wherein the tetraethyleneglycol di-n-heptanoate is present in a quantity of about 30 to 45 parts per hundred of polyvinyl butyral.
Claim 7
Dependent Claim
18 words
A laminar structure of claim 1 wherein the plasticizer comprises a mixture of tetraethyleneglycol di-n-heptanoate and triethyleneglycol di-2-ethylbutyrate.
Claim 8
Dependent Claim
18 words
A laminar structure of claim 1 comprising two layers of glass and one layer of the plastic composition.
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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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |