US3033806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of shaped expanded thermoplastic polymer
Assignee: Wyeth Holdings LLC
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Filing: 1958-11-17
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Granted: 1962-05-08
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Expires: 1978-11-17
Abstract
No abstract record available.
Inventors
- 👤 Frank R Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J2325/00; Y; Y10; Y10S; Y10S206/00; Y10S206/819; Y10S220/00; Y10S220/902; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A METHOD OF MAKING A SOLID SHAPED MASS OF CELLULAR STRUCTURE FROM THERMOPLASTIC VINYL ARMATIC RESINOUSUS POLYMERS WHICH CONTAIN INCORPORATED THEREIN FROM ABOUT 3% TO ABOUT 15%, BASED ON THE WEIGHT OF THE POLYMER, OF A VOLATILE EXPANDING AGENT HAVING A GASIFYING TEMPERATURE BELOW THE SOFTENING POINT OF SAID POLYMER, BY A SINGLE EXPANSION STEP, WHICH CONSISTS OF COMPLETELY FILLING A SHAPED APPARATUS WITH IRREGULAR SHAPED BULKY, STRINGY, VERMIFORM, NONEXPANDED DISCRETE PARTICLES OF SAID POLYMER, SAID NONEXPANDED PARTICLES HAVING A BULK DENSITY NOT GREATER THAN THAT OF THE FINISHED FOAMED SHAPE AND UNCOMPRESSED, UNEXPANDED BULK DENSITY NOT GREATER THAN 12 POUNDS PER CUBIC FOOT, AND HEATING THE IMPREGNATED PARTICLES IN SAID SHAPING APPARATUS AT A TEMPERATURE ABOVE THE SOFTENING POINT OF SAID IMPREGNATED POLYMER TO EFFECT EXPANSION THEREOF AND UNTIL THE DISCRETE PARTICLES EXPAND INTO A CELLULAR STUCTURE CONFORMING TO THE CONTOUR OF SAID SHAPING APPARATUS AND ARE MUTUALLY SINTERED INTO AN INTEGRAL SHAPED SOLID CELLULAR MASS.
Claim 2
Independent Claim
157 words
A METHOD OF MAKING A SOLID SHAPED MASS OF CELLULAR STRUCTURE FROM THERMOPLASTIC VINYL ARMATIC RESINOUSUS POLYMERS WHICH CONTAIN INCORPORATED THEREIN FROM ABOUT 3% TO ABOUT 15%, BASED ON THE WEIGHT OF THE POLYMER, OF A VOLATILE EXPANDING AGENT HAVING A GASIFYING TEMPERATURE BELOW THE SOFTENING POINT OF SAID POLYMER, BY A SINGLE EXPANSION STEP, WHICH CONSISTS OF COMPLETELY FILLING A SHAPED APPARATUS WITH IRREGULAR SHAPED BULKY, STRINGY, VERMIFORM, NONEXPANDED DISCRETE PARTICLES OF SAID POLYMER, SAID NONEXPANDED PARTICLES HAVING A BULK DENSITY NOT GREATER THAN THAT OF THE FINISHED FOAMED SHAPE AND UNCOMPRESSED, UNEXPANDED BULK DENSITY NOT GREATER THAN 12 POUNDS PER CUBIC FOOT, AND HEATING THE IMPREGNATED PARTICLES IN SAID SHAPING APPARATUS AT A TEMPERATURE ABOVE THE SOFTENING POINT OF SAID IMPREGNATED POLYMER TO EFFECT EXPANSION THEREOF AND UNTIL THE DISCRETE PARTICLES EXPAND INTO A CELLULAR STUCTURE CONFORMING TO THE CONTOUR OF SAID SHAPING APPARATUS AND ARE MUTUALLY SINTERED INTO AN INTEGRAL SHAPED SOLID CELLULAR MASS.
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |