Patent US2498410A successfully refreshed from Google Patents.
US3637538A
Expired / Lapsed
US
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Foamable styrene polymer resins
Assignee: Monsanto Chemicals Ltd
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Filing: 1968-06-13
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Granted: 1972-01-25
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Expires: 1988-06-13
Abstract
Abstract FOAMABLE RESIN PARTICLES COMPRISING A MONOVINYLIDENE AROMATIC POLYMER, A VOLATILE BLOWING AGENT, AND AN AMIDE HAVING A MELTING POINT IN THE RANGE OF 35-115*C. AND CORRESPONDING TO THE GENERAL FORMULA RCONHR'' WHEREIN R IS AN ALIPHATIC HYDROCARBON RADICAL CONTAINING 10-24 CARBON ATOMS AND R'' IS HYDROGEN OR AN ALKYL RADICAL CONTAINING 1-3 CARBON ATOMS; AND PROCESSES FOR PREPARING FOAMED ARTICLES BY STEAM-HEATING THE FOAMABLE RESIN PARTICLES TO FORM A PREFOAM AND SUBSEQUENTLY TREATING THE PREFOAM WITH STEAM IN A MOLD.
Inventors
- 👤 Charles Robert Heald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08K; C08K5/00; C08K5/16; C08K5/20; C08J2325/00; C08J2325/02; Y; Y10; Y10S; Y10S264/00; Y10S264/09; Y10S264/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |