Patent US2797443A successfully refreshed from Google Patents.
US2797443A
Expired / Lapsed
US
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Process of making foamed resins
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-09-17
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Granted: 1957-07-02
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Expires: 1974-09-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank A Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:43
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/127; C08J2203/00; C08J2203/14; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR PRODUCING EXTRUDED POLYSTYRENE FOAMS OF FINE PORE SIZE WHICH COMPRISES BLENDING A PARTICULATE STYRENE POLYMER CONTAINING FROM 1 TO 10% PENTANE BY WEIGHT WITH FROM 2 TO 3% WATER BY WEIGHT, BASED ON THE COMBINED WEIGHT OF POLYMER AND PENTANE, AND IMMEDIATELY THEREAFTER EXTRUDING THE BLENDED MATERIAL AT TEMPERATURES ABOVE 250*F. AND AT A DIE PRESSURE OF 50-130 P. S. I.
Claim 2
Dependent Claim
64 words
A PROCESS FOR PRODUCING EXTRUDED POLYSTYRENE FOAMS OF FINE PORE SIZE WHICH COMPRISES BLENDING A PARTICULATE STYRENE POLYMER CONTAINING FROM 1 TO 10% PENTANE BY WEIGHT WITH FROM 2 TO 3% WATER BY WEIGHT, BASED ON THE COMBINED WEIGHT OF POLYMER AND PENTANE, AND IMMEDIATELY THEREAFTER EXTRUDING THE BLENDED MATERIAL AT TEMPERATURES ABOVE 250*F. AND AT A DIE PRESSURE OF 50-130 P. S. I.
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) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |