US2891017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of finely porous materials using nitrosamine as gas evolving agent
Assignee: Rhein Chemie Rheinau GmbH
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Filing: 1956-08-24
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Granted: 1959-06-16
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Expires: 1976-08-24
Abstract
No abstract record available.
Inventors
- 👤 Kern Rudolf
- 👤 Wilhelm N Grohs
- 👤 Blumel Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/107; Y; Y10; Y10S; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR THE MANUFACUTRE OF MATERIALS HAVING A FINELY CELLULAR SUBSTANTIALLY CLOSED PORE STRUCTURE, WHICH COMPROSES INTIMATELY MIXING A NITROSAMINE AS A GAS-EVOLVING AGENT WHEREIN THE NITROSAMINE IS SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND SUBSTITUTED ALIPHATIC PRIMARY NITROSAMINES AND ALIPHATIC, CYCLOALIPHATIC, SUBSTITUTED ALIPHATIC AND SUBSTITUTED CYCLOALIPHATIC SECONDARY NITROSAMINES CONTAINING AT LEAST TWO NITROSAMINE GROUPS AND A SURFACE-ACTIVE AGENT, INTIMATELY MIXING THE RESULTING MIXTURE WITH AN UNCURED ORGANIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF NAUTRAL RUBBER, VINYL POLYMERIZATION PRODUCTS, PHENOPLASTS, AND AMINOPLASTS, AND SUBSEQUENTLY CURING THE MIXTURE WITH THE ACID OF HEAT TO PRODUCE A MATERIAL HAVING A SUBSTANTIALLY CLOSED PORE STRUCTURE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR THE MANUFACUTRE OF MATERIALS HAVING A FINELY CELLULAR SUBSTANTIALLY CLOSED PORE STRUCTURE, WHICH COMPROSES INTIMATELY MIXING A NITROSAMINE AS A GAS-EVOLVING AGENT WHEREIN THE NITROSAMINE IS SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND SUBSTITUTED ALIPHATIC PRIMARY NITROSAMINES AND ALIPHATIC, CYCLOALIPHATIC, SUBSTITUTED ALIPHATIC AND SUBSTITUTED CYCLOALIPHATIC SECONDARY NITROSAMINES CONTAINING AT LEAST TWO NITROSAMINE GROUPS AND A SURFACE-ACTIVE AGENT, INTIMATELY MIXING THE RESULTING MIXTURE WITH AN UNCURED ORGANIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF NAUTRAL RUBBER, VINYL POLYMERIZATION PRODUCTS, PHENOPLASTS, AND AMINOPLASTS, AND SUBSEQUENTLY CURING THE MIXTURE WITH THE ACID OF HEAT TO PRODUCE A MATERIAL HAVING A SUBSTANTIALLY CLOSED PORE STRUCTURE.
References Cited (Backward Citations)
US2466826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-15 | 1962-12-15 | 1963-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-15 | 1966-12-15 | 1967-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-15 | 1970-12-15 | 1971-06-16 | $7700.00 | Window Closed / Lapsed |