Patent US3233016A successfully refreshed from Google Patents.
US3233016A
Expired / Lapsed
US
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Process for preparing dimensionally stable styrene polymer foam
Assignee: Atlantic Richfield Co
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Filing: 1961-11-30
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Granted: 1966-02-01
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Expires: 1981-11-30
Abstract
No abstract record available.
Inventors
- 👤 Kracht Gerhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:04
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; Y; Y10; Y10S; Y10S521/00; Y10S521/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PREPARING DIMENSIONALLY STABLE STYRENE POLYMER FOAM WHICH COMPRISES HEATING EXPANDABLE STYRENE POLYMER PARTICLES UNDER RESTRAINT, WHEREBY THE PARTICLES COALESCE AND FUSE TOGETHER TO FORM A FOAMED STRUCTURE SHOWING DISCRETE PARTICLES, COOLING THE STRUCTURE TO A TEMPERATURE AT WHICH THE STRUCTURE IS SELF-SUSTAINING AND ABOVE AMBIENT ATMOSPHERIC TEMPERATURE, SAID STRUCTURE BEING SUBSTANTIALLY FULLY EXPANDED AND THEREAFTER MAINTAINING THE STRUCTURE IN AIR AT AN ELEVATED TEMPERATURE BELOW THAT AT WHICH THE STRUCTURE POSTEXPANDS AND ABOVE THAT AT WHICH THE STRUCTURE SHRINKS UNTIL THE PRESSURE WITHIN THE STRUCTURE HAS EQUALIZED ITSELF WITH THE AMBIENT ATMOSPHERIC PRESSURE SUCH THAT THE VACUUM WITHIN SAID STRUCTURE IS ELIMINATED.
Claim 2
Dependent Claim
105 words
A PROCESS FOR PREPARING DIMENSIONALLY STABLE STYRENE POLYMER FOAM WHICH COMPRISES HEATING EXPANDABLE STYRENE POLYMER PARTICLES UNDER RESTRAINT, WHEREBY THE PARTICLES COALESCE AND FUSE TOGETHER TO FORM A FOAMED STRUCTURE SHOWING DISCRETE PARTICLES, COOLING THE STRUCTURE TO A TEMPERATURE AT WHICH THE STRUCTURE IS SELF-SUSTAINING AND ABOVE AMBIENT ATMOSPHERIC TEMPERATURE, SAID STRUCTURE BEING SUBSTANTIALLY FULLY EXPANDED AND THEREAFTER MAINTAINING THE STRUCTURE IN AIR AT AN ELEVATED TEMPERATURE BELOW THAT AT WHICH THE STRUCTURE POSTEXPANDS AND ABOVE THAT AT WHICH THE STRUCTURE SHRINKS UNTIL THE PRESSURE WITHIN THE STRUCTURE HAS EQUALIZED ITSELF WITH THE AMBIENT ATMOSPHERIC PRESSURE SUCH THAT THE VACUUM WITHIN SAID STRUCTURE IS ELIMINATED.
References Cited (Backward Citations)
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US2857625A
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US3023175A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |