US2888407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellular material from bitumen and styrene
Assignee: Expanded Rubber Co Ltd
•
Filing: 1952-06-02
•
Granted: 1959-05-26
•
Expires: 1972-06-02
Abstract
No abstract record available.
Inventors
- 👤 Cooper Alfred
- 👤 Macqueen Leonard Baxter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J9/06; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; E04C2/205; C08J2395/00; Y; Y10; Y10S; Y10S206/00; Y10S206/819
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
A PROCESS FOR THE PRODUCTION OF A CLOSED CELL EXPANDED MATERIAL CONSISTING PREDOMINANTLY OF BITUMEN, WHICH PROCESS COMPRISES MIXING INTO A PASTE THE BITUMEN, A BLOWING AGENT, AN ETHYL CELULOSE TOGETHER WITH A SOLVENT CONSISTING OF ISOPROPYL ACETATE AND MONOMERIC STYRENE, HEATING THE MIXTURE TO THE TEMPERATURE AT WHICH THE BLOWING AGENT FORMS A GAS UNDER SUFFICIENT PRESSURE TO PREVENT THE GAS FROM FULLY EXPANDING THE MASS, COOLING THE MASS, RELEASING THE PRESSURE, AND FINALLY REHEATING TO A TEMPERATURE AT WHICH THE EMPRYO GAS BUBBLES WILL EXPAND THE MATERIAL, AND HOLDING THE MATERIAL AT THAT TEMPERATURE UNTIL THE ISOPROPYL ACETATE PRESENT HAS BEEN REMOVED AND THE STYRENE CONVERTED INTO A HARD POYLMER.
References Cited (Backward Citations)
CA461607A
Cited
US2132969A
Cited
US2314181A
Cited
US2386995A
Cited
GB578513A
Cited
US2384611A
Cited
GB632208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |