US3468820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of particulate expandable styrene polymers
Assignee: BASF SE
•
Filing: 1966-01-10
•
Granted: 1969-09-23
•
Expires: 1986-01-10
Abstract
No abstract record available.
Inventors
- 👤 Karl Buchholz
- 👤 Erhard Stahnecker
- 👤 Johannes Grohmann
- 👤 Rolf Moeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08F; C08F291/00; C08J9/16; C08J9/20; C08J2325/00; C08J2457/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2983692A
Cited
US2886552A
Cited
US2888410A
Cited
US3001954A
Cited
US2957857A
Cited
US3051682A
Cited
US3186975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |