US2948928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing foamed polyurethane articles
Assignee: Bayer AG
•
Filing: 1956-12-17
•
Granted: 1960-08-16
•
Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 Ebneth Harold
- 👤 Falk Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:54
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/582; B29B7/74; B29B7/7404; B29B7/7409; B29B7/7414; B29C; B29C44/00; B29C44/02; B29C44/10; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN THE PREPARATION OF A SOLIDIFIED CELLULAR POLYURETHANE BY A PROCESS WHICH COMPRISES MIXING LIQUID COMPONENTS TOGETHER IN A MIXING CHAMBER AND FLOWING THE RESULTIING MIXTURE INTO A SUITABLE SHAPING DEVICE WHILE IT IS STILL LIQUID AND BEFORE ANY SUBSTANTIAL AMOUNT OF CHEMICAL REACTION BETWEEN SAID COMPONENTS, THE METHOD OF PREDETERMINING THE CELL SIZE AND THE NUMBER OF CELLS PER UNIT OF AREA OF SOLIDIFIED PRODUCT WHICH COMPRISES FLOWING THE SAID MIXTURE WHILE STILL LIQUID THROUGH AN ELONGATED ENCLOSED PASSAGEWAY THEREBY RETARDING THE FLOW THEREOF FROM SAID CHAMBER AND BUILDING UP A BACK PRESSURE, WHEREBY SAID CELL SIZE OF THE PRODUCT AFTER SOLIDIFICATION IS LARGER AND THE NUMBER OF CELLS PER UNIT AREA SMALLER THE GREATER THE RETARDATION OF FLOW OF LIQUID FROM SAID CHAMBER.
Claim 2
Dependent Claim
125 words
IN THE PREPARATION OF A SOLIDIFIED CELLULAR POLYURETHANE BY A PROCESS WHICH COMPRISES MIXING LIQUID COMPONENTS TOGETHER IN A MIXING CHAMBER AND FLOWING THE RESULTIING MIXTURE INTO A SUITABLE SHAPING DEVICE WHILE IT IS STILL LIQUID AND BEFORE ANY SUBSTANTIAL AMOUNT OF CHEMICAL REACTION BETWEEN SAID COMPONENTS, THE METHOD OF PREDETERMINING THE CELL SIZE AND THE NUMBER OF CELLS PER UNIT OF AREA OF SOLIDIFIED PRODUCT WHICH COMPRISES FLOWING THE SAID MIXTURE WHILE STILL LIQUID THROUGH AN ELONGATED ENCLOSED PASSAGEWAY THEREBY RETARDING THE FLOW THEREOF FROM SAID CHAMBER AND BUILDING UP A BACK PRESSURE, WHEREBY SAID CELL SIZE OF THE PRODUCT AFTER SOLIDIFICATION IS LARGER AND THE NUMBER OF CELLS PER UNIT AREA SMALLER THE GREATER THE RETARDATION OF FLOW OF LIQUID FROM SAID CHAMBER.
References Cited (Backward Citations)
CA458729A
Cited
US1585169A
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US1496807A
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US2450436A
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US2567949A
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US2598127A
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US2673723A
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US2642403A
Cited
GB699667A
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US2764565A
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US2816741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |