US3063954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing flame-retardant expandable polystyrene particles
Assignee: Beazer East Inc
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Filing: 1960-10-25
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Granted: 1962-11-13
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Expires: 1980-10-25
Abstract
No abstract record available.
Inventors
- 👤 Eugene V Galizia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:24
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08F; C08F257/00; C08F257/02; C08F8/00; C08F8/18; C08F8/20; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; C08J2425/00; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PRODUCING FLAME-RETARDANT EXPANDABLE POLYSTYRENE PARTICLES COMPRISING FORMING AN AQUEOUS SUSPENSION OF A SOLUTION OF STYRENE MONOMER AND BROMINATED POLYSTYRENE WHOSE BROMINE CONTENT IS SUFFICIENT TO YIELD UPON POLYMERIZATION OF SAID SOLUTION A POLYSTYRENE HAVING A BROMINE CONTENT OF AT LEAST 0.5% BY WEIGHT, POLYMERIZING SAID SOLUTION TO SUBSTANTIAL COMPLETENESS BY HEATING SAID SUSPENSION TO PRODUCE A SYSTEM OF PARTICLES OF BROMINE-CONTAINING-POLYSTYRENE IN AN AQUEOUS MEDIUM, ADDING A VOLATILE HYDROCARBON HAVING A BOILING POINT BETWEEN 25 AND 90*C. TO SAID SYSTEM, HEATING SAID SYSTEM UNDER PRESSURE TO CAUSE SAID HYDROCARBON TO BEE INCORPORATED INTO SAID PARTICLES WHEREBY SAID PARTICLES ARE RENDERED EXPANDABLE UNDER THE INFLUENCE OF HEAT, AND THERE RECOVERING SAID PARTICLES.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PRODUCING FLAME-RETARDANT EXPANDABLE POLYSTYRENE PARTICLES COMPRISING FORMING AN AQUEOUS SUSPENSION OF A SOLUTION OF STYRENE MONOMER AND BROMINATED POLYSTYRENE WHOSE BROMINE CONTENT IS SUFFICIENT TO YIELD UPON POLYMERIZATION OF SAID SOLUTION A POLYSTYRENE HAVING A BROMINE CONTENT OF AT LEAST 0.5% BY WEIGHT, POLYMERIZING SAID SOLUTION TO SUBSTANTIAL COMPLETENESS BY HEATING SAID SUSPENSION TO PRODUCE A SYSTEM OF PARTICLES OF BROMINE-CONTAINING-POLYSTYRENE IN AN AQUEOUS MEDIUM, ADDING A VOLATILE HYDROCARBON HAVING A BOILING POINT BETWEEN 25 AND 90*C. TO SAID SYSTEM, HEATING SAID SYSTEM UNDER PRESSURE TO CAUSE SAID HYDROCARBON TO BEE INCORPORATED INTO SAID PARTICLES WHEREBY SAID PARTICLES ARE RENDERED EXPANDABLE UNDER THE INFLUENCE OF HEAT, AND THERE RECOVERING SAID PARTICLES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-12 | 1966-05-14 | 1966-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-12 | 1970-05-14 | 1970-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-12 | 1974-05-14 | 1974-11-13 | $7700.00 | Window Closed / Lapsed |