US3547412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lightweight concrete
Assignee: BASF SE
•
Filing: 1968-09-09
•
Granted: 1970-12-15
•
Expires: 1988-09-09
Abstract
No abstract record available.
Inventors
- 👤 Karl-Heinz Klages
- 👤 Georg Friedrich Weisbrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:55
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; B; B28; B28C; B28C5/00; B28C5/38; B28C5/381; B28C5/386; B28C9/00; B28C9/002; C04B20/00; C04B20/10; C04B40/00; C04B40/0028
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) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |