US3207205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion-devolatilization process
Assignee: Avantor Performance Materials LLC
•
Filing: 1961-06-16
•
Granted: 1965-09-21
•
Expires: 1981-06-16
Abstract
No abstract record available.
Inventors
- 👤 Briskin Joseph
- 👤 Charles H Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:40
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/26; C08F6/28; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; C08F6/001; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD OF IMPROVING THE HEAT RESISTANCE AND LIGHT STABILITY OF COPOLYMERS OF ALPHA-ALKYL STYRENES AND ALKYL METHACRYLATES WHICH COMPRISES PASSING A CRUDE COPOLYMERIC MASS COMPRISING 15 TO 40 PARTS BY WEIGHT OF AN ALPHA-ALKYL STYRENE AND 60 TO 85 PARTS BY WEIGHT OF AN ALKYL METHACRYLATE, EACH OF THE SAID ALKYL GROUPS HAVING FROM 1 TO 4 CARBON ATOMS, AND UNREACTED MONOMERS THROUGH A SCREW EXTRUDER AT A TEMPERATURE WITHIN THE RANGE OF 400* TO 530*F. AND A VACUUM OF 2 TO 100 MM. OF MERCURY ABSOLUTE PRESSURE FOR A PERIOD OF TEME SUFFICIENT TO VOLATILIZE MONOMERIC MATERIALS CONTAINED THEREIN AND RECOVERING FROM THE EXTRUDER, DEVOLATILIZED COPOLYMER HAVING A HEAT DISTORTION TEMPERATURE OF AT LEAST 110*C.
Claim 2
Independent Claim
117 words
A METHOD OF IMPROVING THE HEAT RESISTANCE AND LIGHT STABILITY OF COPOLYMERS OF ALPHA-ALKYL STYRENES AND ALKYL METHACRYLATES WHICH COMPRISES PASSING A CRUDE COPOLYMERIC MASS COMPRISING 15 TO 40 PARTS BY WEIGHT OF AN ALPHA-ALKYL STYRENE AND 60 TO 85 PARTS BY WEIGHT OF AN ALKYL METHACRYLATE, EACH OF THE SAID ALKYL GROUPS HAVING FROM 1 TO 4 CARBON ATOMS, AND UNREACTED MONOMERS THROUGH A SCREW EXTRUDER AT A TEMPERATURE WITHIN THE RANGE OF 400* TO 530*F. AND A VACUUM OF 2 TO 100 MM. OF MERCURY ABSOLUTE PRESSURE FOR A PERIOD OF TEME SUFFICIENT TO VOLATILIZE MONOMERIC MATERIALS CONTAINED THEREIN AND RECOVERING FROM THE EXTRUDER, DEVOLATILIZED COPOLYMER HAVING A HEAT DISTORTION TEMPERATURE OF AT LEAST 110*C.
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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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |