US2891016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of finely porous butadiene-styrene copolymers
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
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR THE MANUFACTURE OF MATERIALS HAVING A FINELY CELLULAR SUBSTANTIALLY FINE PORE STURCTURE; WHICH COMPRISES FIRST INTIMATELY MIXING TOGHETER A SURFACE-ACTIVE AGENT AND AS A BLOWING AGENT A COMPOUND, SELECTED FROM THE GROUP CONSISTING OF AMMONIUM BICARBONATE, AMMONIUM CARBONATE, BENZENE SULPHONIC ACID HYDRAZIDE AND UREA WHICH EVOLVES ON THERMAL DECOMPOSITON A GAS SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, AMMONIA AND SULPHUR DIOXIDE, THEREAFTER INTIMATELY INCORPORTATING THE RESULTING MIXTURE IN AN UNCURED POLOLYMER OF BUTADIENE AND STYRENE, AND SUBSEQUENTLY CURING THE MIXTURE WITH THE ACID OF HEAT TO PRODUCE A MATERIAL HAVING A SUBSTANTIALLY CLOSED PORE STRUCTURE.
Claim 2
Dependent Claim
100 words
A PROCESS FOR THE MANUFACTURE OF MATERIALS HAVING A FINELY CELLULAR SUBSTANTIALLY FINE PORE STURCTURE; WHICH COMPRISES FIRST INTIMATELY MIXING TOGHETER A SURFACE-ACTIVE AGENT AND AS A BLOWING AGENT A COMPOUND, SELECTED FROM THE GROUP CONSISTING OF AMMONIUM BICARBONATE, AMMONIUM CARBONATE, BENZENE SULPHONIC ACID HYDRAZIDE AND UREA WHICH EVOLVES ON THERMAL DECOMPOSITON A GAS SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, AMMONIA AND SULPHUR DIOXIDE, THEREAFTER INTIMATELY INCORPORTATING THE RESULTING MIXTURE IN AN UNCURED POLOLYMER OF BUTADIENE AND STYRENE, 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 |