US3468993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of portland cement products
Assignee: Individual
•
Filing: 1966-09-06
•
Granted: 1969-09-23
•
Expires: 1986-09-06
Abstract
No abstract record available.
Inventors
- 👤 Knud Georg Bierlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:04
CPC Classifications
C; C04; C04B; C04B40/00; C04B40/02; C04B40/0231; B; B28; B28B; B28B11/00; B28B11/24; B28B11/245
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
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 |