Patent US2576977A successfully refreshed from Google Patents.
US2576977A
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Method of making free-flowing cellular pellets of thermoplastic resins
Assignee: Dow Chemical Co
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Filing: 1949-02-10
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Granted: 1951-12-04
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Expires: 1969-02-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Stober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:26
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29C; B29C33/00; B29C33/56; B29C33/60; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; B29C44/50; C; C08; C08J; C08J9/00; C08J9/16; Y; Y10; Y10S; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD OF MAKING FREE-FLOWING CELLULAR PELLETS OF A THERMOPLASTIC RESIN WHICH COMPRISES EXTRUDING, AT TEMPERATURES BETWEEN 60* AND 120* C., A MOBILE GEL CONSISTING OF A THERMOPLASTIC RESIN HAVING A NORMALLY GASEOUS AGENT DISSOLVED THEREIN UNDER PRESSURE THROUGH A CONSTRICTED PASSAGEWAY TO A ZONE OF LOWER PRESSURE, CUTTING THE EXTRUDING PLASTIC GEL INTO SEGMENTS BEFORE COMPLETE EXPANSION OCCURS AND THEREAFTER CAUSING THE SEVERED PIECES TO FALL FREELY THROUGH THE AIR WHILE COMPLETING THE EXPANSION.
Claim 2
Independent Claim
75 words
A METHOD OF MAKING FREE-FLOWING CELLULAR PELLETS OF A THERMOPLASTIC RESIN WHICH COMPRISES EXTRUDING, AT TEMPERATURES BETWEEN 60* AND 120* C., A MOBILE GEL CONSISTING OF A THERMOPLASTIC RESIN HAVING A NORMALLY GASEOUS AGENT DISSOLVED THEREIN UNDER PRESSURE THROUGH A CONSTRICTED PASSAGEWAY TO A ZONE OF LOWER PRESSURE, CUTTING THE EXTRUDING PLASTIC GEL INTO SEGMENTS BEFORE COMPLETE EXPANSION OCCURS AND THEREAFTER CAUSING THE SEVERED PIECES TO FALL FREELY THROUGH THE AIR WHILE COMPLETING THE EXPANSION.
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) | 1954-12-03 | 1955-06-04 | 1955-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-03 | 1959-06-04 | 1959-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-03 | 1963-06-04 | 1963-12-04 | $7700.00 | Window Closed / Lapsed |