Patent US2906385A successfully refreshed from Google Patents.
US3558752A
Expired / Lapsed
US
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Foamed resins production
Assignee: Monsanto Chemicals Ltd
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Filing: 1968-11-21
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Granted: 1971-01-26
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Expires: 1988-11-21
Abstract
Abstract A PROCESS FOR PREPARING FOAMED THERMOPLASTIC RESINS HAVING A FINE, UNIFORM CELL SIZE BY EXTRUDING INTO A ZONE OF LOWER PRESSURE A HEAT-SOFTENED FOAMABLE THERMOPLASTIC RESIN CONTAINING A VOLATILE BLOWING AGENT UNDER PRESSURE AND A NUCLEATING AGENT COMPRISING ORTHOBORIC ACID. THE NUCLEATING AGENT PREFERABLY ALSO COMPRISES A WAX OR A FINELY-DIVIDED INERT SOLID SUCH AS SILICA OR TALC.
Inventors
- 👤 Sen Durgacharan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; C08J9/0066; C08K; C08K3/00; C08K3/38; C08K7/00; C08K7/22; C08K7/24; C08K7/26; C08L; C08L23/00; C08L23/02; C08L91/00; C08L91/06; B29K; B29K2023/00; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S521/00; Y10S521/908
Claims Analysis
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |