US2740157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for shaping plastic foams
Assignee: Dow Chemical Co
•
Filing: 1951-12-07
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Granted: 1956-04-03
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Expires: 1971-12-07
Abstract
No abstract record available.
Inventors
- 👤 Mccurdy John Lloyd
- 👤 Long Chancey E De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:37
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29L; B29L2007/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A METHOD WHEREIN A PLASTIC FOAM BODY IS PRODUCED BY EXTRUDING A STREAM OF A FLOWABLE GEL, OF A THERMOPLASTTIC RESIN HAVING A NORMALLY GASEOUS AGENT DISSOLVED THEREIN, FROM A PRESSURIZED ZONE TO A ZONE OF LOWER PRESSURE, WHEREUPON SAID AGENT VAPORIZES WITH RESULTANT SWELLING OF THE EXTRUDED MATERIAL AND FORMATION OF THE PLASTIC FOAM BODY, THE STEPS OF FEEDING THE STREAM OF EXPANDING EXTRUDED MATERIAL INTO A SLOT-LIKE CHANNEL BETWEEN A PAIR OF SHAPING MEMBERS, HAVING PARALLEL AND SUNSTANTIALLY HORIZONTAL INNER SURFACES WHICH DEFINE THE WIDTH OF THE CHANNEL, AT A FEED RATE SUCH AS TO FILL A SECTION OF THE CHAN-
Claim 2
Dependent Claim
104 words
IN A METHOD WHEREIN A PLASTIC FOAM BODY IS PRODUCED BY EXTRUDING A STREAM OF A FLOWABLE GEL, OF A THERMOPLASTTIC RESIN HAVING A NORMALLY GASEOUS AGENT DISSOLVED THEREIN, FROM A PRESSURIZED ZONE TO A ZONE OF LOWER PRESSURE, WHEREUPON SAID AGENT VAPORIZES WITH RESULTANT SWELLING OF THE EXTRUDED MATERIAL AND FORMATION OF THE PLASTIC FOAM BODY, THE STEPS OF FEEDING THE STREAM OF EXPANDING EXTRUDED MATERIAL INTO A SLOT-LIKE CHANNEL BETWEEN A PAIR OF SHAPING MEMBERS, HAVING PARALLEL AND SUNSTANTIALLY HORIZONTAL INNER SURFACES WHICH DEFINE THE WIDTH OF THE CHANNEL, AT A FEED RATE SUCH AS TO FILL A SECTION OF THE CHAN-
References Cited (Backward Citations)
US1818101A
Cited
US2075735A
Cited
US1919361A
Cited
US2011160A
Cited
US2168889A
Cited
US2354260A
Cited
US2512506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |