Patent US3551967A successfully refreshed from Google Patents.
US3551967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete pipe molding apparatus
Assignee: Individual
•
Filing: 1968-07-18
•
Granted: 1971-01-05
•
Expires: 1988-07-18
Abstract
Abstract AN APPARATUS AND METHOD OF MANUFACTURING CONCRETE PIPE ARE DISCLOSED. THE PIPE IS MOUNTED IN A MOULD COMPRISING A BASE, AN INNER CYLINDRICAL FORM AND AN OUTER CYLINDRICAL FORM. A VIBRATORY DRIVER IS ATTACHED TO METAL CYLINDRICAL REINFORCING CAGES ORDINARILY MADE OF STEEL MESH. THE PIPE MOULD IS FILLED WITH CONCRETE, THE REINFORCING CAGES WITH THE ATTACHED DRIVER ARE RAISED ABOVE THE FILLED MOULD AND SET UPON THE PLASTIC CONCRETE. THE VIBRATORY DRIVER IS ACTIVATED AND THE REINFORCING CAGES ARE DRIVEN DOWN IN THE PLASTIC CONCRETE TO THE DESIGNATED POSITION BY THE VIBRATION OF THE DRIVER.
Inventors
- 👤 Frank M Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:41
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/56
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |