US3789028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated foamable styrene polymer particles
Assignee: Hoechst AG
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Filing: 1972-07-03
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Granted: 1974-01-29
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Expires: 1992-07-03
Abstract
Abstract FOAMABLE PARTICLES OF THE STYRENE POLYMERS AND A VOLATILE BLOWING AGENT AND A LIPOPHILIC SURFACE-ACTIVE COATING AGENT, WHEREIN THESE PARTICLES CONTAIN, AS A COATING AGENT, FROM 0.05 TO 0.5% BY WEIGHT, CACULATED ON THE BLOWING AGENT CONTAINING STYRENE POLYMER, OF MIXTURES OF MONO-, DI- AND TRI-ESTERS OF GLYCEROL WITH SATURATED FATTY ACIDS HAVING FROM 12 TO 22 CARBON ATOMS, OR MIXTURES THEREOF. THESE FOAMABLE PARTICLES OFFER AN ESSENTIAL SHORTENING OF THE COOLING TIME DURING FOAMING, A BETTER BOND OF THE FOAMED PARTICLES AND A SUBSTANTIALLY UNIFORM DISTRIBUTION OF THE GROSS UNIT WEIGHT IN THE FOAM BLOCK.
Inventors
- 👤 E Heiskel
- 👤 H Last
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:24
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08J2325/00; C08J2325/02; C08J2325/04
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |