US3052927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A method of centrifugally molding cellular plastics
Assignee: Bayer AG
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Filing: 1957-08-12
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Granted: 1962-09-11
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Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Hoppe Peter
- 👤 Weinbrenner Erwin
- 👤 Breer Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:33
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C44/0423; B29C44/043; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C41/00; B29C41/02; B29C41/04; Y; Y10; Y10S; Y10S425/00; Y10S425/05; Y10S521/00; Y10S521/918
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
A METHOD FOR MAKING A CELLULAR POLYURETHANE PLASTIC ARTICLE HAVING A CONCENTRIL LAYER OF CELLULAR POLYURETHANE PLASTIC OF ONE DENSITY AND REGIDITY, AND A SECOND CONCENTRIC LAYER OF A CELLULAR POLYURETHANE PLASTIC OF ANOTHER DENSITY AND RIGIDITY WHICH COMPRISES POURING INTO A ROTATING MOLD A FOAABLE LIQUID REACTION MIXTURE WHICH, UPON CHEMICAL REACTION, FORMS SA CELLULAR POLYURETHANE PLASTIC, POURING A SECOND LIQUID FOAMABLE REACTION MIXTURE OF A DIFFERENT COMPOSITION INTO SAID ROTATING MOLD ON THE FIRST SAID LAYER AND CONTINUALLY ROTATING THE MOLD AT A SPEED WHICH PRODUCES A CENTRIFUGAL FORCE UNTIL THE CHEMICAL REACTANTS OCCUR AND TWO LAYERS OF DIFFERENT DENSITY SOLIDIFY.
References Cited (Backward Citations)
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Cited
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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) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |