US3088925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of expandable polystyrene particles
Assignee: Armstrong World Industries Inc
•
Filing: 1960-03-01
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Granted: 1963-05-07
•
Expires: 1980-03-01
Abstract
No abstract record available.
Inventors
- 👤 Wade E Hall
- 👤 Algirdas C Poshkus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
THE METHOD OF FORMING EXPANDABLE POLYSTYRENE PARTICLES HAVING A NORMALLY LIQUID PETROLEUM ETHER EXPANDING AGENT IN WHICH SAID POLYSTYRENE IS INSOLUBLE DISPERSED THROUGHOUT SAID POLYSTYRENE PARTICLES, WHICH METHOD COMPRISES IMMERSING POLYSYRENE PARTICLES IN A REACTOR CONTAINING AN QUEOUS SOLUTION OF POLYVINYL ALCOHOL CONTAINING FROM 0.5 TO 5.0 PERCENT BY WEIGHT POLYVINYL ALCOHOL BASED UPON THE WEIGHT OF SAID POLYSTYRENE, ADDING ABOUT FIFTY PARTS BY WEIGHT OF PETROLEUM ETHER TO SAID AQUEOUS SOLUTION, THE AMOUNT OF WATER IN SAID SOLUTION BEING FROM 1 TO 15 TIMES, BY WEIGHT, THE AMOUNT OF PETROLEUM ETHER, SEALING SAID REACTOR AND HEATING SAID IMMERSED POLYSTYRENE PARTICLES AT A TEMPERATURE IN THE RANGE OF 120*C. TO 150*C. AND A PRESSURE OF ABOUT FIFTY-ONE POUNDS PER SQUARE INCH, COOLING SAID REACTOR RAPIDLY, AND SEPARATING SAID POLYSTYRENE PARTICLES IN A FROM FREE OF AGGLOMERATES.
Claim 2
Independent Claim
136 words
THE METHOD OF FORMING EXPANDABLE POLYSTYRENE PARTICLES HAVING A NORMALLY LIQUID PETROLEUM ETHER EXPANDING AGENT IN WHICH SAID POLYSTYRENE IS INSOLUBLE DISPERSED THROUGHOUT SAID POLYSTYRENE PARTICLES, WHICH METHOD COMPRISES IMMERSING POLYSYRENE PARTICLES IN A REACTOR CONTAINING AN QUEOUS SOLUTION OF POLYVINYL ALCOHOL CONTAINING FROM 0.5 TO 5.0 PERCENT BY WEIGHT POLYVINYL ALCOHOL BASED UPON THE WEIGHT OF SAID POLYSTYRENE, ADDING ABOUT FIFTY PARTS BY WEIGHT OF PETROLEUM ETHER TO SAID AQUEOUS SOLUTION, THE AMOUNT OF WATER IN SAID SOLUTION BEING FROM 1 TO 15 TIMES, BY WEIGHT, THE AMOUNT OF PETROLEUM ETHER, SEALING SAID REACTOR AND HEATING SAID IMMERSED POLYSTYRENE PARTICLES AT A TEMPERATURE IN THE RANGE OF 120*C. TO 150*C. AND A PRESSURE OF ABOUT FIFTY-ONE POUNDS PER SQUARE INCH, COOLING SAID REACTOR RAPIDLY, AND SEPARATING SAID POLYSTYRENE PARTICLES IN A FROM FREE OF AGGLOMERATES.
References Cited (Backward Citations)
GB756654A
Cited
US2888410A
Cited
US2893963A
Cited
US2816827A
Cited
US2911381A
Cited
US2994670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-06 | 1966-11-05 | 1967-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-06 | 1970-11-05 | 1971-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-06 | 1974-11-05 | 1975-05-07 | $7700.00 | Window Closed / Lapsed |