US2537977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a shaped thermoplastic cellular product
Assignee: Dow Chemical Co
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Filing: 1948-07-15
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Granted: 1951-01-16
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Expires: 1968-07-15
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Dulmage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08J9/145; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; Y; Y10; Y10S; Y10S264/00; Y10S264/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A METHOD OF MAKING A SHAPED THERMOPLASTIC CELLULAR BODY FROM A MOBILE GEL COMPRISING A THERMOPLASTIC RESIN HAVING A NORMALLY GASEOUS AGENT DISSOLVED THEREIN UNDER PRESSURE, THE STEPS OF EXTRUDING THE MOBILE GEL AT TEMPERATURES BETWEEN 60* C. AND 120* C. THROUGH A CONSTRICTED PASSAGEWAY INTO AN OPEN FORMING AND SHAPING CHAMBER AND FEEDING WATER AT TEMPERATURES BETWEEN 120* F. AND 225* F., AS LUBRICANT, BETWEEN THE INNER WALLS OF SAID CHAMBER AND OUTER SURFACES OF THE EXPANDING PLASTIC, WITHOUT INTIMATELY ADMIXING THE WATER WITH THE BODY OF PLASTIC MATERIAL, WHILE FORMING AND SHAPING THE EXPANDING PLASTIC BY PASSAGE THROUGH SAID CHAMBER.
Claim 2
Dependent Claim
103 words
IN A METHOD OF MAKING A SHAPED THERMOPLASTIC CELLULAR BODY FROM A MOBILE GEL COMPRISING A THERMOPLASTIC RESIN HAVING A NORMALLY GASEOUS AGENT DISSOLVED THEREIN UNDER PRESSURE, THE STEPS OF EXTRUDING THE MOBILE GEL AT TEMPERATURES BETWEEN 60* C. AND 120* C. THROUGH A CONSTRICTED PASSAGEWAY INTO AN OPEN FORMING AND SHAPING CHAMBER AND FEEDING WATER AT TEMPERATURES BETWEEN 120* F. AND 225* F., AS LUBRICANT, BETWEEN THE INNER WALLS OF SAID CHAMBER AND OUTER SURFACES OF THE EXPANDING PLASTIC, WITHOUT INTIMATELY ADMIXING THE WATER WITH THE BODY OF PLASTIC MATERIAL, WHILE FORMING AND SHAPING THE EXPANDING PLASTIC BY PASSAGE THROUGH SAID CHAMBER.
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) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |