Patent US3170972A successfully refreshed from Google Patents.
US3170972A
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Method of extruding a polyurethane article
Assignee: Bayer AG
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Filing: 1961-01-10
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Granted: 1965-02-23
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Expires: 1981-01-10
Abstract
No abstract record available.
Inventors
- 👤 Knipp Ulrich
- 👤 Muhlhausen Cornelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0895; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/06; B29C48/09; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10; Y; Y10; Y10S; Y10S264/00; Y10S264/77
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A PROCESS FOR FORMING POLYURETHANE PLASTIC RODS AND TUBES WHICH COMRISES MIXING UNDER PRESSURE THE LIQUID REACTION COMPONENTS OF A POLYURETHANE PLASTIC, IMMEDIATELY PASSING THE STILL LIQUID REACTION MIXTURE UNDER THE PRESSURE EXERTED IN SAID MIXING STEP THROUGH A PASSAGEWAY HAVING SUBSTANTIALLY SMOOTH WALLS AT A RATE SUCH THAT THE RESIDENCE TIME THEREIN IS LONGER THAN 1 1/2 TIMES THE CURING OF THE REACTION MIXTURE AND MAINTAINING THE TEMPERATURE OF SAID PASSAGEWAY AT LEAST EQUAL TO THAT OF SAID POLYURETHANE REACTION MIXTURE, SAID PASSAGEWAY HAVING THE CROSS-SECTIONAL CONFIGURATION OF THE DESIRED FINAL PRODUCT SO THE LIQUID COMPONENTS REACT WITHIN SAID PASSAGEWAY TO FORM A DIMENSIONALLY STABLE PRODUCT BEFORE EXITING THEREFROM.
Claim 2
Dependent Claim
110 words
A PROCESS FOR FORMING POLYURETHANE PLASTIC RODS AND TUBES WHICH COMRISES MIXING UNDER PRESSURE THE LIQUID REACTION COMPONENTS OF A POLYURETHANE PLASTIC, IMMEDIATELY PASSING THE STILL LIQUID REACTION MIXTURE UNDER THE PRESSURE EXERTED IN SAID MIXING STEP THROUGH A PASSAGEWAY HAVING SUBSTANTIALLY SMOOTH WALLS AT A RATE SUCH THAT THE RESIDENCE TIME THEREIN IS LONGER THAN 1 1/2 TIMES THE CURING OF THE REACTION MIXTURE AND MAINTAINING THE TEMPERATURE OF SAID PASSAGEWAY AT LEAST EQUAL TO THAT OF SAID POLYURETHANE REACTION MIXTURE, SAID PASSAGEWAY HAVING THE CROSS-SECTIONAL CONFIGURATION OF THE DESIRED FINAL PRODUCT SO THE LIQUID COMPONENTS REACT WITHIN SAID PASSAGEWAY TO FORM A DIMENSIONALLY STABLE PRODUCT BEFORE EXITING THEREFROM.
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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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |