Patent US3396441A successfully refreshed from Google Patents.
US3396441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective apparatus for concrete pipe forming machines
Assignee: Austin Concrete Works Inc
•
Filing: 1965-10-04
•
Granted: 1968-08-13
•
Expires: 1985-10-04
Abstract
No abstract record available.
Inventors
- 👤 Harold G Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:07
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/02; B28B21/10; B28B21/22; B28B21/24; B28B21/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1106086A
Cited
US1862709A
Cited
US1891731A
Cited
US1899115A
Cited
US2178015A
Cited
US3083433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |