US3290262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing rigid cellular materials and products obtained thereby
Assignee: Pneumatiques Caoutchouc Manufacture et Plastiques Kleber Colombes SA
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Filing: 1964-03-12
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Granted: 1966-12-06
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Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Andre Alexandre Leclercq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2495/00; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD OF PREPARING RIGID CELLULAR MATERIALS HAVING CLOSED CELLS AND CONTAINING POLYVINYL CHLORIDE AS A MAJOR CONSTITUENT BY WEIGHT, WHICH CONSISTS IN THE SUCCESSIVE STEPS OF MIXING IN A HOMOGENEOUS MANNER POLYVINYL CHLORIDE, A HEAT-DECOMPOSABLE BLOWING AGENT, A POLYISOCYANATE AND A BITUMEN CONSISTING OF A SOLID OR SEMI-SOLID NATURAL OR SYNTHETIC HYDROCARBON, SOLUBLE IN CARBON DISULFIDE AND HAVING A SOFTENING POINT BETWEEN 80 C. AND 200*C., THE AMOUNT OF THE POLYVINYL CHLORIDE BEING FROM 2.5 TO 100 TIMES THE WEIGHT OF BITUMEN, HEATING THE MIXTURES UNDER PRESSURE IN A MOULD TO DECOMPOSE THE BLOWING AGENT AND TO GELL THE POLYVINYL CHLORIDE, COOLING THE EXPANDED MATERIAL UNDER PRESSURE AND REMOVING IT FROM THE MOULD, AND PLACING THE EXPANDED MATERIAL IN CONTACT WITH HOT WATER OR WATER VAPOUR TO EFFECT FURTHER EXPANSION OF THE MATERIAL.
Claim 2
Independent Claim
134 words
A METHOD OF PREPARING RIGID CELLULAR MATERIALS HAVING CLOSED CELLS AND CONTAINING POLYVINYL CHLORIDE AS A MAJOR CONSTITUENT BY WEIGHT, WHICH CONSISTS IN THE SUCCESSIVE STEPS OF MIXING IN A HOMOGENEOUS MANNER POLYVINYL CHLORIDE, A HEAT-DECOMPOSABLE BLOWING AGENT, A POLYISOCYANATE AND A BITUMEN CONSISTING OF A SOLID OR SEMI-SOLID NATURAL OR SYNTHETIC HYDROCARBON, SOLUBLE IN CARBON DISULFIDE AND HAVING A SOFTENING POINT BETWEEN 80 C. AND 200*C., THE AMOUNT OF THE POLYVINYL CHLORIDE BEING FROM 2.5 TO 100 TIMES THE WEIGHT OF BITUMEN, HEATING THE MIXTURES UNDER PRESSURE IN A MOULD TO DECOMPOSE THE BLOWING AGENT AND TO GELL THE POLYVINYL CHLORIDE, COOLING THE EXPANDED MATERIAL UNDER PRESSURE AND REMOVING IT FROM THE MOULD, AND PLACING THE EXPANDED MATERIAL IN CONTACT WITH HOT WATER OR WATER VAPOUR TO EFFECT FURTHER EXPANSION OF THE MATERIAL.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |