Patent US3560414A successfully refreshed from Google Patents.
US3560414A
Expired / Lapsed
US
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Process for preparing foamable beads
Assignee: Dart Industries Inc
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Filing: 1968-02-09
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Granted: 1971-02-02
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Expires: 1988-02-09
Abstract
Abstract THE PROCESS COMPRISES COATING BEADS OF A POLYMER SUCH AS POLYSTYRENE WITH AN ORGANIC AGENT, FOR EXAMPLE, ZINC STEARATE, IMPREGNATING THE COATED BEADS WITH LIQUEFIED BUTANE AT CONDITIONS SUFFICIENT TO MAINTAIN THE BUTANE IN THE LIQUEFIED STATE, REMOVING THE EXCESS BUTANE FROM THE IMPREGNATED BEADS AND RECOVERING THE RESULTING FOAMABLE BEADS. COATING THE BEADS PREVENTS BEAD AGGLOMERATION DURING THE IMPREGNATION STEP.
Inventors
- 👤 John J Miskel Jr
- 👤 Alfred J Ackerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/18
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |