Patent US3224984A successfully refreshed from Google Patents.
US3224984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing expanded polystyrene containing a polyolefin
Assignee: Shell USA Inc
•
Filing: 1963-01-02
•
Granted: 1965-12-21
•
Expires: 1983-01-02
Abstract
No abstract record available.
Inventors
- 👤 Alec N Roper
- 👤 Edward G Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08F; C08F255/00; C08F255/02; C08F291/00; C08J9/0061; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; C08J2423/00; C08L23/00; C08L23/02; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A METHOD FOR PRODUCING EXPANDED POLYSTYRENE HAVING AN AVERAGE CELL DIAMETER BELOW 95 MICRONS, WHICH COMPRISES HEATING TO A TEMPERATURE BETWEEN 90* AND 120*C. A POLYSTYRENE COMPOSITION CONTAINING EVENLY DISTRIBUTED THEREIN FROM 0.01 TO 0.5 PERCENT BY WEIGHT OF FINELY DIVIDED PARTICLES OF POLYOLEFIN HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT BETWEEN 1000 AND 4000 AND, AS A VOLATILE EXPANDING AGENT, A SATURATED HYDROCARBON BOILING BETWEEN 10* AND 90*C.
Claim 2
Independent Claim
68 words
A METHOD FOR PRODUCING EXPANDED POLYSTYRENE HAVING AN AVERAGE CELL DIAMETER BELOW 95 MICRONS, WHICH COMPRISES HEATING TO A TEMPERATURE BETWEEN 90* AND 120*C. A POLYSTYRENE COMPOSITION CONTAINING EVENLY DISTRIBUTED THEREIN FROM 0.01 TO 0.5 PERCENT BY WEIGHT OF FINELY DIVIDED PARTICLES OF POLYOLEFIN HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT BETWEEN 1000 AND 4000 AND, AS A VOLATILE EXPANDING AGENT, A SATURATED HYDROCARBON BOILING BETWEEN 10* AND 90*C.
References Cited (Backward Citations)
US2744291A
Cited
US2988528A
Cited
US2979476A
Cited
US2999828A
Cited
US3060136A
Cited
US3048551A
Cited
US3060138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |