Patent US2941977A successfully refreshed from Google Patents.
US2941977A
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Transparent molding compositions of copolymers of vinyl aromatic hydrocarbons and esters of methacrylic acid and copolymers of butadiene and styrene and method of making
Assignee: Dow Chemical Co
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Filing: 1957-08-12
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Granted: 1960-06-21
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Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Roche
- 👤 Bernard H Tubbs
- 👤 Jones Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:24
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A TRANSPARENT MOLDABLE THERMOPLASTIC COMPOSITION OF MATTER COMPRISING FROM 50 TO 70 PARTS BY WEIGHT OF A COPOLYMER HAVING A REFRACTIVE INDEX BETWEEN ND25 1.5350 AND ND25 1.5750 AND CONTAINING IN CHEMICALLY COMBINED FORM FROM 5 TO 62 PERCENT BY WEIGHT OF A METHACRYLIC ACID ESTER HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
50 words
A TRANSPARENT MOLDABLE THERMOPLASTIC COMPOSITION OF MATTER COMPRISING FROM 50 TO 70 PARTS BY WEIGHT OF A COPOLYMER HAVING A REFRACTIVE INDEX BETWEEN ND25 1.5350 AND ND25 1.5750 AND CONTAINING IN CHEMICALLY COMBINED FORM FROM 5 TO 62 PERCENT BY WEIGHT OF A METHACRYLIC ACID ESTER HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |