US3635852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making a general purpose expandable alkenyl aromatic polymer containing di-alkyl polysiloxane internally
Assignee: Huntsman Chemical Corp
•
Filing: 1969-12-15
•
Granted: 1972-01-18
•
Expires: 1989-12-15
Abstract
Abstract EXPANADABLE ALKENYL AROMATIC POLYMER COMPOSITIONS ARE PREPARED BY POLYMERIZING IN AQUEOUS SUSPENSION AN ALKENYL AROMATIC MONOMER HAVING MIXED THEREIN ABOUT 0.0005 TO 0.05% BY WEIGHT OF A LIQUID ORGANICALLY DISUBSTITUTED POLYSILOXANE AND THROUGHLY WASHING TH RESULTING EXPANDABLE PARTICULATE PRODUCT.
Inventors
- 👤 Arnold B Finestone
- 👤 Michal Niechwiadowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:48
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/16; C08J9/20; C08J2325/00; C08J2325/02; C08J2325/04; C08J2483/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |