Patent US2808379A successfully refreshed from Google Patents.
US2808379A
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Process for foaming resins using furan adduct foaming agents and foamable compositions containing same
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-08-30
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Granted: 1957-10-01
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Expires: 1974-08-30
Abstract
No abstract record available.
Inventors
- 👤 Henry A Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR PREPARING FOAMED SYNTHETIC RESINS WHICH COMPRISES MIXING A FUSIBLE SYNTHETIC RESIN WIITH DIELS-ALDER ADDUCT OF FURAN AND A COMPOUND TAKEN FROM THE GROUP CONSISTING OF MALEIC ACID, MALEIC ANHYDRIDE. FUMARIC ACID, THE ACID CHLORIDES THEREOF AND THE ESTERS THEREOF, SAID MIXING STEP BEING CARRIED OUT AT TE PERATURES BELOW 125*C. AND THEN SUBJECTING THE MIXTURE TO A TEMPERATURE OF FROM 130*C. TO 200*C.
Claim 2
Dependent Claim
66 words
A PROCESS FOR PREPARING FOAMED SYNTHETIC RESINS WHICH COMPRISES MIXING A FUSIBLE SYNTHETIC RESIN WIITH DIELS-ALDER ADDUCT OF FURAN AND A COMPOUND TAKEN FROM THE GROUP CONSISTING OF MALEIC ACID, MALEIC ANHYDRIDE. FUMARIC ACID, THE ACID CHLORIDES THEREOF AND THE ESTERS THEREOF, SAID MIXING STEP BEING CARRIED OUT AT TE PERATURES BELOW 125*C. AND THEN SUBJECTING THE MIXTURE TO A TEMPERATURE OF FROM 130*C. TO 200*C.
References Cited (Backward Citations)
US2532242A
Cited
US2653139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |