US3817879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate expandable styrene polymers coated with a carboxamide
Assignee: BASF SE
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Filing: 1972-07-28
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Granted: 1974-06-18
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Expires: 1992-07-28
Abstract
Abstract THE INVENTION RELATES TO EXPANDABLE STYRENE POLYMERS HAVING A SHORT MINIMUM MOLD RESIDENOE TIME DUE TO A COATING OF 0.05 TO 2% BY WEIGHT OF A CARBOXAMIDE OF THE FORMULA R-COHN-R'' WHICH MELTS AT FROM 60* TO 110* C,R BEING ALKYL OR ALKENYL OF 7 TO 21 CARBON ATOMS AND R'' ALKYL OR ALKENYL OF 8 TO 22 CARBON ATOMS.
Inventors
- 👤 M Walter
- 👤 H Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:01
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08J2325/00; C08J2325/02; C08J2325/04
Claims Analysis
Total Claims: 0
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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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |