Patent US3428288A successfully refreshed from Google Patents.
US3428288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic core for concrete ducts or pipes of noncircular section
Assignee: MINI IND CONST MASINI
•
Filing: 1965-11-26
•
Granted: 1969-02-18
•
Expires: 1985-11-26
Abstract
No abstract record available.
Inventors
- 👤 Vasile Luca
- 👤 Gheorghe Runceanu
- 👤 Ctin Cosmescu
- 👤 Alexandru Ionescu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:01
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; B28B7/32
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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |