Patent US2974125A successfully refreshed from Google Patents.
US2974125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of methyl methacrylate possessing good elongation values
Assignee: Dow Chemical Co
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Filing: 1953-08-24
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Granted: 1961-03-07
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Expires: 1973-08-24
Abstract
No abstract record available.
Inventors
- 👤 John L Lang
- 👤 Jones Clifford
- 👤 Arthur F Roche
- 👤 Frank L Ingley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:42
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/10; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF MAKING A THERMOPLASTIC, MOLDABLE COPOLYMER, CHARACTERIZED BY AN ULTIMATE ELONGATION OF MORE THAN 10 PERCENT, WHICH COMPRISES COPOLYMERIZING AT LEAST THE FIRST TWO OF THE MONOMERIC COMPOUNDS METHYL METHACRYLATE, ACRYLONITRILE AND STYRENE, IN ONE OF THE PROPORTIONS REPRESENTED BY POINTS FALLING WITHIN AND ON THE PERIMETER OF AREA A ON THE ANNEXED DRAWING, BY HEATING A HOMOGENEOUS LIQUID POLYMERIZATION MIXTURE CONSISTING ESSENTIALLY OF SUCH MONOMERIC COMPOUNDS AND THE COPOLYMER PRODUCT OF POLYMERIZATION THEREOF AT A POLYMERIZATION TEMPERATURE BETWEEN ABOUT 130*C. AND ABOUT 155*C., THE PROPORTION OF COPOLYMER PRODUCT BEING FROM 10 TO 50 PERCENT BY WEIGHT OF THE POLYMERIZATION MIXTURE, MAINTAINING THE PROPORTIONS OF MONOMERIC COMPOUNDS AND THE PORTION OF COPOLYMER PRODUCT IN THE POLY-
Claim 2
Independent Claim
118 words
A METHOD OF MAKING A THERMOPLASTIC, MOLDABLE COPOLYMER, CHARACTERIZED BY AN ULTIMATE ELONGATION OF MORE THAN 10 PERCENT, WHICH COMPRISES COPOLYMERIZING AT LEAST THE FIRST TWO OF THE MONOMERIC COMPOUNDS METHYL METHACRYLATE, ACRYLONITRILE AND STYRENE, IN ONE OF THE PROPORTIONS REPRESENTED BY POINTS FALLING WITHIN AND ON THE PERIMETER OF AREA A ON THE ANNEXED DRAWING, BY HEATING A HOMOGENEOUS LIQUID POLYMERIZATION MIXTURE CONSISTING ESSENTIALLY OF SUCH MONOMERIC COMPOUNDS AND THE COPOLYMER PRODUCT OF POLYMERIZATION THEREOF AT A POLYMERIZATION TEMPERATURE BETWEEN ABOUT 130*C. AND ABOUT 155*C., THE PROPORTION OF COPOLYMER PRODUCT BEING FROM 10 TO 50 PERCENT BY WEIGHT OF THE POLYMERIZATION MIXTURE, MAINTAINING THE PROPORTIONS OF MONOMERIC COMPOUNDS AND THE PORTION OF COPOLYMER PRODUCT IN THE POLY-
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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) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |