US3050476A
Expired / Lapsed
US
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Method of making a self extinguishing expandable polymer of styrene by bromination
Assignee: Beazer East Inc
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Filing: 1958-12-08
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Granted: 1962-08-21
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Expires: 1978-12-08
Abstract
No abstract record available.
Inventors
- 👤 John J Tress
- 👤 William J Heilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J2325/00; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
METHOD OF MAKING A SELF-EXTINGUISHING EXPANDABLE POLYMER OF STYRENE, COMPRISING ADDING PARTICLES OF SAID POLYMER TO AN AQUEOUS MEDIUM AT A TEMPERATURE OF 40-120* C, SAID AQUEOUS MEDIUM CONTAINING FROM AT LEAST 2% TO 10% BY WEIGHT BROMINE BASED UPON THE QUANTITY OF SAID PARTICLES, CONTACTING THE BROMINE IN SAID MEDIUM WITH AN ACTIVATING AGENT FOR THE BROMINE AT LEAST UNTIL THE COLOR OF SAID MEDIUM CHANGES FROM ORANGE TO A PALE YELLOW, AND RECOVERING SAID POLYMER FROM SAID MEDIUM, SAID POLYMER HAVING BEEN RENDERED CAPABLE OF EXPANSION BY THE INCORPORATION THEREIN OF A VOLATILE ALIPHATIC HYDROCARBON BOILING IN THE RANGE OF -10 TO 81* C.
Claim 2
Dependent Claim
106 words
METHOD OF MAKING A SELF-EXTINGUISHING EXPANDABLE POLYMER OF STYRENE, COMPRISING ADDING PARTICLES OF SAID POLYMER TO AN AQUEOUS MEDIUM AT A TEMPERATURE OF 40-120* C, SAID AQUEOUS MEDIUM CONTAINING FROM AT LEAST 2% TO 10% BY WEIGHT BROMINE BASED UPON THE QUANTITY OF SAID PARTICLES, CONTACTING THE BROMINE IN SAID MEDIUM WITH AN ACTIVATING AGENT FOR THE BROMINE AT LEAST UNTIL THE COLOR OF SAID MEDIUM CHANGES FROM ORANGE TO A PALE YELLOW, AND RECOVERING SAID POLYMER FROM SAID MEDIUM, SAID POLYMER HAVING BEEN RENDERED CAPABLE OF EXPANSION BY THE INCORPORATION THEREIN OF A VOLATILE ALIPHATIC HYDROCARBON BOILING IN THE RANGE OF -10 TO 81* C.
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) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |